104 posts categorized "References"

April 04, 2013

When to Include the Year in Citations Appearing More Than Once in a Paragraph

Tyler

 

 

by Tyler Krupa

You may already know that references in APA Style are cited in text with an author–date system (e.g., Smith, 2012). But do you know when to include the year of publication when one of your citations appears more than once in a paragraph? Getting it right is simple as long as you remember the following two guidelines:

1. All parenthetical citations (i.e., citations in which both the author name and publication date are enclosed within parentheses) should include the year, regardless of how often they appear in a paragraph.

2. When the name of the author is part of the narrative and appears outside of parentheses, after the first citation in each paragraph you need not include the year in subsequent nonparenthetical citations as long as the study cannot be confused with other studies in the article (see p. 174 in the sixth edition of the Publication Manual).

To help illustrate these guidelines, let’s look at a few examples that correctly show when to include the year in citations appearing more than once in a paragraph:

Morin (1988) described two separate but linked epidemics. . . . Morin distinguished the HIV (viral) epidemic from the subsequent AIDS (disease) epidemic, foreseeing the ultimate convergence of preventing the spread of the virus and managing the disease it causes. . . . Morin also discussed a third epidemic . . . . This third epidemic is as much a part of the pathology of AIDS as the virus itself (Morin, 1988).

Socioeconomic status (SES) and chronic diseases rather consistently fall on a gradient, where those of relatively lower SES have poorer health and are more often afflicted by multiple diseases than those above them on the SES ladder (Adler & Stewart, 2010). . . . Adler and Stewart (2010) offered a framework to explain the major pathways by which SES can influence health outcomes. . . . The model is developmental, illustrating individual, social, and structural influences on disease over the lifespan (Adler & Stewart, 2010).

We hope these examples clear up this point of possible uncertainty. Still have questions? Leave us a comment.

 

March 14, 2013

Finding Federal Statutes

Melissa.photo

 

 

 

by Melissa

Legal research is a different type of beast. The skilled hunter of psychology data may need a guide when tracking down information for an APA Style reference to a federal statute. This blog post is your guide to tracking down the text of a federal statute and the statute’s name, title number, section number, and year. Happy hunting!

The sixth edition of the APA Publication Manual states that the United States Code is the official source for federal statutes. Where can I find a copy of it?
If you can’t get your hands on a printed copy of the United States Code, there’s an exact copy of the code on the Government Printing Office’s (GPO’s) website (http://www.gpoaccess.gov/uscode/index.html).

According to the 19th edition of The Bluebook: A Uniform System of Citation, the PDF version of the code on the GPO website can be cited as if it were the printed copy. However, for some information, it is helpful to consult a printed copy of the code.

Printed copies of the United States Code may be found in any law library. Some law schools and some state and local government offices have law libraries that are open to the public. Try an Internet search to find one near you.

You also may find a printed copy of the code in one of the Government Printing Office’s (GPO’s) federal depository libraries. Check the Federal Depository Library public page on the GPO website to find a federal depository library near you (http://catalog.gpo.gov/fdlpdir/FDLPdir.jsp).

 

How do I find the official name of a statute?
The official name can be found in the text of the statute. Search the first few subsections of the statute to find the name. The words Short Title usually appear before the official name of the statute. Remember, not all statutes have names.

In the screenshot below, the name of the statute, National Environmental Policy Act of 1969, is under the heading Short Title, in section 4321.

NEP.code.page

 

If I know the name of a statute, but not the title or section numbers, how can I find them?
Use the Popular Name Tool on the U.S. House of Representatives website at http://uscode.house.gov/popularnames/popularnames.htm to find the title number, section numbers, and section in which the name of the statute can be found.

A search for the National Environmental Policy Act yields the following results:

NEP.popular.name.page
The results show that the statute can be found in Title 42 of the United States Code, beginning at section 4321; the short title (name) of the statute can be found in Title 42, section 4321 note. Confirm this information by consulting your copy of the United States Code.

 

How do I find the right year to use in the reference?
The edition year should come from, in order of preference, the spine of the volume of the United States Code that you are using, the year on the title page of the volume, or the latest copyright year.

 

List of Research Resources
Federal depository libraries: http://catalog.gpo.gov/fdlpdir/FDLPdir.jsp
PDF copy of the United States Code: http://www.gpoaccess.gov/uscode/index.html
Popular Name Tool: http://uscode.house.gov/popularnames/popularnames.htm

 

February 21, 2013

Writing References for Federal Statutes

Melissa.photo

 

 

 

by Melissa

It’s 2 a.m. You are hunched over a laptop computer, and you have 20 ounces of hastily drunk coffee sloshing around in your stomach, or maybe you have a sheaf of heavily edited, stained papers spread across half your desk, while you gnaw on half an inch of wood or whatever it is that lead pencils are made of these days. Is this stressful scenario what your process for creating challenging references looks like?

Researching and writing may be stressful, but with the right resources, creating references can be relatively easy. Relax, put down the oversized coffee cup (or chewed up pencil), and take a look at this simple template for creating APA Style references for federal statutes:

Name of the Statute, Title number Source § Section number(s) (Year).

 

Parts of the Reference
There are just five pieces of information that you need when creating an APA Style reference for a basic federal statute: the name of the statute, the title number, the name of the source in which you found the statute, the section number(s) of the statute, and the year of the source in which you found the statute.

This blog post defines each of these elements and shows you how to put them together to create a reference and an in-text citation. A subsequent blog post will provide more information on how to find this information in official and authoritative sources.

 

1. Name of the Statute. If a statute has a common name, this is the first element of the APA Style reference. The name of the statute is followed by a comma. If a statute doesn’t have a name, omit this element, and start with the title number.

Note that the terms statute and act refer to the same thing; you will see them used interchangeably if you regularly work with legal materials.

The name of one statute is the Family and Medical Leave Act of 1993.

 

2. Title Number. The title number is the second element that appears in APA Style references for a named statute. If a statute does not have a name, the title number is the first element. Note that in the Publication Manual, the title number is referred to as the volume number.

 Title numbers identify the subject matter group to which a statute belongs. For instance, in the collection of statutes known as the United States Code, education statutes are grouped in Title 20, public health and welfare statutes are grouped in Title 42, and labor statutes

The Family and Medical Leave Act of 1993 is in Title 29 of the United States 
Code.

 

3. Source. The official source for federal statutes is the United States Code. In the reference, use an abbreviated version of this title: U.S.C.

Although statutes can be found in other places, use the official code unless it is not available (e.g., a recently passed statute usually cannot be found in the United States Code; therefore, it would be appropriate to cite another source).

 

4. Section number(s). A statute is usually divided into several numbered sections and subsections. In a reference for a statute, a section symbol (§) should be listed before the section number. If your reference includes more than one section, provide the first and last section numbers, preceded by a double section symbol (§§), and separate

The Family and Medical Leave Act of 1993 runs from section 2601 to 
section 2654, formatted as §§ 2601–2654.

 

5. Year. Finish the reference with the edition year of the United States Code (not the year that the statute was enacted). Set the year in parentheses, and end the reference with a period.

The Family and Medical Leave Act of 1993 can be found in the last 
printing of the full United States Code, which has an edition year of 2006.

 

Reference Example
A reference list entry for a federal statute looks like this:

Family and Medical Leave Act of 1993, 29 U.S.C. §§ 2601–2654 (2006).

 

In-Text Citation Example
The in-text citation format for a federal statute is similar to that for other APA Style references. Cite the name of the statute and the year:

Family and Medical Leave Act of 1993 (2006)
(Family and Medical Leave Act of 1993, 2006)

 

Bluebook
If your work includes statutes that differ from the basic format shown above, requiring you to go beyond the scope of Appendix 7.1, be sure to consult The Bluebook: A Uniform System of Citation.

February 07, 2013

Introduction to APA Style Legal References

Melissa.photo

 

by Melissa


Writers sometimes try to squeeze a reference for a statute or a court decision into the same format as a journal article, essentially trying to shove a square peg into a round hole. It won’t fit, it won’t look quite right, and it won’t be as useful to your readers as it could be.

There’s a better way. Instead of contorting legal references like pretzels, consult one or more of the following style resources: Appendix 7.1 in the Publication Manual of the American Psychological Association, this blog, and the specialized style resources discussed below.

 

1. Appendix 7.1 in the Publication Manual

When creating APA Style legal references, your first and best resource is the Publication Manual’s Appendix 7.1: References to Legal Materials (pp. 216–224). There, you’ll find sample references for the legal documents that are most commonly used in psychology research, including court decisions, statutes, administrative regulations, and executive orders.

The reference examples in Appendix 7.1 are drawn from The Bluebook: A Uniform System of Citation, which is an authoritative source for legal citations and the primary style guide used by legal scholars and other professionals in that field. The reference and citation formats that you’ll find in Appendix 7.1 are a hybrid of APA Style and Bluebook style, adapted to both fit well in an APA Style article and provide the unique information that will allow your readers to find the referenced legal document.

 

2. The APA Style Blog

The APA Style Blog already provides some resources for legal references. Citation of the U.S. Constitution is discussed in How to Cite the U.S. Constitution in APA Style. Capitalization of the names of legal documents is discussed in Do I Capitalize This Word?

New blog posts to help you find, reference, and cite other legal materials in APA Style are on the way. These posts will cover the following topics:

As each topic is added to the blog, we’ll include a link to the relevant post in the above list.

 

3. Additional Resources

The Bluebook. If you’re working with more complex legal references that require you to go beyond the scope of Appendix 7.1, be sure to consult The Bluebook, which provides citation formats for constitutions, international treaties, domestic and foreign statutes, legislative bills and resolutions, administrative regulations and proceedings, executive orders, legal briefs and other court filings, reported and unreported court decisions, and many other legal documents.

Because Bluebook citation style relies heavily on footnotes and doesn’t include the reference list and name–date citations that are the hallmarks of APA Style, when you use a legal reference format from The Bluebook, consult Appendix 7.1 in the Publication Manual and, using the create-a-reference skills that you learned from our Frankenreference blog post, adapt the reference to closely follow the examples in Appendix 7.1.

Law Librarian. The law mutates. New laws that alter or overrule existing laws are passed all the time. You may wish to consult a law librarian to ensure that your references are complete and correct and that the law you are citing has not been superseded or overturned.

Additional Information Online. Finally, one other resource that I find helpful in my own research is the online guide Introduction to Basic Legal Citation by Peter W. Martin (an emeritus law professor at Cornell University). This is not an official source, so if you consult it, be sure to seek additional verification in The Bluebook.

January 24, 2013

Asking the Right Question: How Can the Reader Find the Source?

Daisiesby Stefanie

Not surprisingly, we receive a lot of questions about how to create references for all sorts of different sources. As has been discussed in past blog posts, a reference can be put together by asking a number of (very good and pertinent) questions: Who? When? What? Where?
 
But (and you knew that was coming!) the most important question, the one you need to ask yourself before you even embark on the reference-generating journey (but especially when that journey is starting to look like Siri generated the directions), is embodied in one word: How.
 
More fully articulated, the “how” question you should ask when a reference is looking confusing is, How is my reader going to retrieve this source? The answer will often clarify how the reference should be formatted.
 
In fact, the retrieval question is the guiding beacon at the heart of many seemingly impossible reference questions we receive, such as How do I create a reference for a PowerPoint presentation? How do I create a reference for a piece of art at the museum? How do I create a reference for an e-book?
 
The PowerPoint question is a classic one here at Style Expert headquarters. But it’s not so tricky: A PowerPoint presentation posted online is no different than any other file posted online. Just get your reader there. If the presentation was seen during a lecture or meeting and cannot be retrieved by the audience of your paper, it’s a personal communication, which means that no reference is needed, but it should be cited accordingly.
 
Consider your paper’s audience when creating a reference for a piece of art—you could create a reference guiding readers to the museum in which it is housed (if, say, it is located close to your class, if you are writing a paper for a course) or a picture of the art elsewhere (if you have a broader audience that might not have access to the particular museum).
 
And that e-book? E-books are available from many different sources and in all different file formats. Show your readers how to retrieve the particular e-book file you read.
 
Do you have additional questions about how to get readers to your sources? E-mail us at [email protected] or leave a comment!

January 18, 2013

Retraction Action

Daisiesby Stefanie

My first word processor was a glorified typewriter; I could type my college papers but only see four lines at a time on a tiny screen, until I hit the print button. What came out often had mistakes that I had not caught on first (cramped) review. Luckily, I could go back, fix the mistakes, and print again. This ritual is also followed by students today, even those using newfangled computers with big screens and programs for catching errors before they are committed to paper. Still, errors sneak by, the slippery buggers.

A step or two up in the publication hierarchy, once an article has been published in a journal (i.e., once the publisher hits print), fixing mistakes becomes a lot trickier. Sometimes, if a small or easily described error is involved, an erratum or correction notice, published in a later issue of the same journal, is printed and linked to the e-version of the original article. Other times, the problems are so great that the entire article is retracted, either by the article author(s) or by the publisher. Whatever the reason for the retraction (e.g., belatedly discovered calculation or measurement errors, plagiarism, falsification of data), the intent is to remove the information from the scientific literature and thus avoid wasting the time and resources of other scientists who may attempt to replicate or rely on the already undermined results.

Yet, a retracted article can still be found, both in print and online. (The silver lining to the retraction cloud may be that there can be usefulness in serving as a bad example. However, if you are not writing specifically about the retraction, consider whether the retracted article is your best resource.) And if it can be found, it can be used as a reference, although readers should be alerted to the article’s retracted status. All of this begs the question, How should a retracted article be formatted for the reference list?

To create a reference for a retracted article, you can repurpose the parentheses found after a reference that includes original publication information, as can be seen in Examples 21 and 26 on pages 203–204 of the Publication Manual of the American Psychological Association, sixth edition. Instead, provide the information on the article’s retraction notice in the parentheses. Examples:

Joly, J. F., Stapel, D. A., & Lindenberg, S. M. (2008). Silence 
     and table manners: When environments activate norms. Personality
     and Social Psychology Bulletin, 34, 1047–1056. (Retraction 
     published 2012, Personality and Social Psychology Bulletin, 38, 
     p. 1378)
Ricaurte, G. A., Yuan, J., Hatzidimitriou, G., Cord, B. J., & McCann, 
     U.D. (2002, September 27). Severe dopaminergic neurotoxicity in 
     primates after a common recreational dose regimen of MDMA. 
     Science, 297, 2260-2263. (Retraction published September 12, 
     2003, Science, 301, p. 1454)

Additional questions? E-mail us at [email protected] or leave a comment!

January 10, 2013

Alligators and Academia: The Importance of Primary and Secondary Sources

Chelsea blog 2by Chelsea Lee

Have you heard about how alligators infest the New York City sewer system? The ones brought north by Florida snowbirds for the summer as pets, who were then jettisoned after they outgrew the family bathtub? Indeed, your cousin’s best friend once saw one with her own eyes. Or, at least, that’s what your cousin told you. But you wonder, is it really true, or is it just an urban legend?

Alligator_in_Shower_Cap

Reliable Sources in Academic Research Are Usually Primary Sources

Likewise, when it comes to academic research, it’s extremely important to make sure that the claims you make are backed up by sound evidence, or else your paper won’t stand up to scrutiny from your professors or colleagues (just like that alligator story didn’t hold up once you started looking into it).

As we saw with the alligator story, one of the best ways to help ensure a source’s reliability is to make sure you’re reading a firsthand account, or a primary source, from someone who saw the events for him- or herself (like the best friend), rather than a secondhand account, or a secondary source, from someone who only heard about the events but didn’t witness them personally (like your cousin). Most of the sources you use in a research paper or thesis should be primary sources, not secondary sources.

How to Spot a Primary Source in the Wild

Primary sources can come in many different forms. For example, a journal or magazine article might report the results of an original experiment, or a book or website might describe a theory or technique the author has developed or has expertise in. Note, however, that not every article, book, website, and so forth contains primary research. To determine whether a document is a primary source, ask, did the authors discover this finding themselves (primary source), or are they reporting what someone else found (secondary source)? 

You’ll have to evaluate each source on a case-by-case basis, but some document types tend to make promising primary sources:

  • journal articles;
  • books and book chapters;
  • some magazine and newspaper articles;
  • reports, such as from government agencies or institutions;
  • dissertations and theses;
  • interview and speech transcripts and recordings;
  • video and audio recordings;
  • personal communications; and
  • webpages.

Secondary Sources: Second Best?

In our alligator story example, the word of the secondary source, your cousin, ended up not being too trustworthy, and that’s why we shied away from citing it. But that’s not always the case with secondary sources—in fact, many secondary sources can be not only reliable but also extremely helpful during the research process. For example, a textbook or an encyclopedia (including Wikipedia) can help you get acquainted with a research area by summarizing others’ research. Or you might read a summary of one scientist’s interesting study in someone else’s journal article. 

In these cases, however, the chief advantage of the secondary source is not the quotes that you find but that it points you to the primary source through a citation. It’s important to read (and then cite) the primary source if you can, because that will enable you to verify the accuracy and completeness of the information.

It would not look good for you to cite a secondary source (like your cousin with the alligator tale) only for someone else (like your professor—or animal control) to inform you later that the truth was in fact something quite the opposite. Even when secondary sources are highly accurate, being thorough and reading the primary sources helps demonstrate your merit as a scientist and researcher and helps others find that helpful information.

Citations to secondary sources are permissible under certain circumstances. For example, if you are discussing Wikipedia in your paper, you should cite it (here are some more of our thoughts on citing Wikipedia). Likewise, some primary sources are unobtainable (such as if they are out of print or impossible to find) or written in a language you don’t understand, so the secondary source is what you should cite. Or the secondary source might offer an analysis of the primary source that you want to refer the reader to. See our post on how and when to cite secondary sources (a.k.a. a source you found in another source) and refer to Publication Manual section 6.17 (p. 178) for directions and examples of citations to secondary sources.

We hope this discussion of primary and secondary sources has helped you understand what types of sources are most effective and helpful to use in a research paper. Also we hope that you will contact us if you ever do find that alligator, because the family bathtub just isn’t the same without him. 

January 03, 2013

Alphabetizing “In Press” and “No Date” References

Tyler

 

 

by Tyler Krupa

You may already know that references with the same authors in the same order are arranged by year of publication, the earliest first (see the sixth edition of the Publication Manual, p. 182):

Meints, K., Plunkett, K., & Harris, P. L. (2002).

Meints, K., Plunkett, K., & Harris, P. L. (2008).

But do you know what to do when a group of references with the same author(s) in the same author order contain “in press” and “no date” publication dates? Alphabetizing these references is easy as long as you remember the following two points:

1. An “in press” work has yet to be published, so if you have one or more references that contain a publication year, these references will always come before an “in press” reference because they’ve already been published.

2. When dealing with “no date” references, simply follow the same “nothing precedes something” guidance that the Publication Manual gives regarding alphabetizing author surnames in the reference list (see p. 181). Using this guideline, “no date” references should always precede references with “some date.” Also remember that “no date” is abbreviated as “n.d.” in both the reference list and the in-text citations (see p. 185).

Here are some examples that show the correct ways to alphabetize these types of references in the reference list:

Johnson, K., & Jones, B. B. (2012).

Johnson, K., & Jones, B. B. (in press).

Taylor, H., Carter, N., & Beckett, S. (n.d.).

Taylor, H., Carter, N., & Beckett, S. (2010).

Taylor, H., Carter, N., & Beckett, S. (in press).

University of Florida. (n.d.).

University of Florida. (2012).

Also remember that if you have two or more “in press” or “no date” references with the same authors in the same order, you should use lowercase letters—a, b, c, and so forth—after the publication date and alphabetize the references by their titles (excluding A, An, and The; see p. 182 in the Publication Manual). The only difference between these types of references and references with publication years is that “in press” and “no date” references contain a hyphen before the a, b, and so forth:

American Speech-Language-Hearing Association. (n.d.-a). The knowledge . . .

American Speech-Language-Hearing Association. (n.d.-b). A strategy to . . .

Schafer, G., & Plunkett, K. (2011a). The power . . .

Schafer, G., & Plunkett, K. (2011b). Task complexity . . .

Schafer, G., & Plunkett, K. (in press-a). The rapid learning . . .

Schafer, G., & Plunkett, K. (in press-b). Sometimes a child . . .

We hope that these examples clear up this point of possible confusion.

December 20, 2012

A Stylish Guide to Holiday Viewing

 

Jeff

 

 

by Jeff Hume-Pratuch


Winter Storm Draco is currently bringing a better-than-average chance of a white Christmas to the Midwest. Although it’s not slated to affect us here at APA Style HQ, I sort of envy you folks in Des Moines and Milwaukee—there’s nothing better on a snowy night than curling up with a warm drink and watching some holiday TV.


With that in mind, here are a few examples of how to cite the can’t-miss fare that’s streaming across the airwaves this weekend. Grab a seat by the fire and pass the cocoa!

Burton, T. (Producer), & Selick, H. (Director). (1993). The 
nightmare before Christmas
[Motion picture]. Burbank, CA:
Touchstone.

Roman, P. (Producer & Director). (2000). Grandma got run over
by a reindeer
[Television special]. Atlanta, GA: Cartoon
Network.

Sager, T. (Writer), & Scardino, D. (Director). (2007).
Ludachristmas [Television series episode]. In T. Fey
(Executive producer), 30 Rock. New York, NY: National
Broadcasting Company.

 

Smith, G., & Hemion, D. (Executive producers), & Binder, S.
(Director). (1978). The Star Wars holiday special
[Television special]. New York, NY: CBS Broadcasting.

Stem, J. D., & Weiss, D. (Writers), & Muzquiz, R. (Director).
(1996). Chanukah [Television series episode]. In V. Coffey,
G. Csupo, & A. Klasky (Executive producers), Rugrats. New
York, NY: Nickelodeon.

 

 

Cocoa_fire
The APA Style staff enjoys a warm beverage before our annual viewing of the Star Wars Holiday Special

Still feeling a bit "Bah, humbug!"-ish? Check out our APA Style holiday playlist: certified to banish dull care by the Ghosts of Christmases Past, Present, and Future (and you know how grumpy he is). We’ll be back in January. Happy holidays from APA Style!

 

 

 

December 13, 2012

How to Cite Different Groups of Authors With the Same Lead Author and Publication Date

Tyler

 

 

by Tyler Krupa

What’s in a name? Properly citing different groups of authors with the same lead author and publication date can make a big difference. When you have two or more references of more than three surnames with the same year and they shorten to the same form (e.g., both Smith, Jones, Young, Brown, & Stanley, 2001, and Smith, Jones, Ward, Lee, & Stanley, 2001, shorten to Smith et al., 2001), clarify which one you are citing each time. On the second and all subsequent citations, cite the surnames of the first two authors and of as many of the next authors as necessary to distinguish the two references, followed by a comma and et al. (see the sixth edition of the Publication Manual, p. 175).

Smith, Jones, Young, et al., 2001

Smith, Jones, Ward, et al., 2001

Are you tempted to use an a or b to designate which is which? This is a common error—placing lowercase letters (a, b, c, etc.) after the publication date instead of citing the necessary surnames. Lowercase letters are used after the publication date only for references with the same author (or with the same two or more authors in the same order) with the same publication date (in which case the references are arranged alphabetically by title; see p. 182 in the Publication Manual). So, using a or b is not appropriate when you have different groups of authors with the same lead author and publication date. Here are some examples that show the correct and incorrect ways to format these types of references in your reference list and in your text citations:

Correct:

McGregor, I., Nash, K., Mann, N., & Phills, C. E. (2010). Anxious uncertainty and reactive approach motivation (RAM). Journal of Personality and Social Psychology, 99, 133–147. doi:10.1037/a0019701

McGregor, I., Nash, K., & Prentice, M. (2010). Reactive approach motivation (RAM) for religion. Journal of Personality and Social Psychology, 99, 148–161. doi:10.1037/a0019702

Incorrect:

McGregor, I., Nash, K., Mann, N., & Phills, C. E. (2010a). Anxious uncertainty and reactive approach motivation (RAM). Journal of Personality and Social Psychology, 99, 133–147. doi:10.1037/a0019701

McGregor, I., Nash, K., & Prentice, M. (2010b). Reactive approach motivation (RAM) for religion. Journal of Personality and Social Psychology, 99, 148–161. doi:10.1037/a0019702

In the examples above, the authors are not the same, and therefore a and b should not be used after the publication date.

When citing these references in the text, cite the necessary number of surnames to distinguish between the references. In these two references, this distinction is not reached until the third author. Here’s how these reference should be cited in text:

Correct:

First citations:

(McGregor, Nash, Mann, & Phills, 2010)

(McGregor, Nash, & Prentice, 2010)

Second and subsequent citations:

(McGregor, Nash, Mann, & Phills, 2010)

(McGregor, Nash, & Prentice, 2010)

Incorrect:

First citations:

(McGregor, Nash, Mann, & Phills, 2010a)

(McGregor, Nash, & Prentice, 2010b)

Second and subsequent citations:

(McGregor et al., 2010a)

(McGregor et al., 2010b)

Note that in the first reference example above, you should use the four surnames “McGregor, Nash, Mann, and Phills” instead of “McGregor, Nash, Mann, et al.” in the second and subsequent citations. The reason for this is that et al. means “and others,” so if there is just one more surname remaining after distinguishing between the two references, just list the final name instead of using et al. (For more examples on how to correctly use et al., see a recent post to our blog.)

Now you know how to properly cite different groups of authors with the same lead author and publication date. Questions? Leave us a comment.

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