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More Than Two Authors Bibliography Meaning

Reference List: Author/Authors


APA (American Psychological Association) style is most commonly used to cite sources within the social sciences. This resource, revised according to the 6th edition, second printing of the APA manual, offers examples for the general format of APA research papers, in-text citations, endnotes/footnotes, and the reference page. For more information, please consult the Publication Manual of the American Psychological Association, (6th ed., 2nd printing).

Contributors: Joshua M. Paiz, Elizabeth Angeli, Jodi Wagner, Elena Lawrick, Kristen Moore, Michael Anderson, Lars Soderlund, Allen Brizee, Russell Keck
Last Edited: 2018-02-21 02:53:07

The following rules for handling works by a single author or multiple authors apply to all APA-style references in your reference list, regardless of the type of work (book, article, electronic resource, etc.).

Single Author

Last name first, followed by author initials.

Berndt, T. J. (2002). Friendship quality and social development. Current Directions in Psychological Science, 11, 7-10.

Two Authors

List by their last names and initials. Use the ampersand instead of "and."

Wegener, D. T., & Petty, R. E. (1994). Mood management across affective states: The hedonic contingency hypothesis. Journal of Personality and Social Psychology, 66, 1034-1048.

Three to Seven Authors

List by last names and initials; commas separate author names, while the last author name is preceded again by ampersand.

Kernis, M. H., Cornell, D. P., Sun, C. R., Berry, A., Harlow, T., & Bach, J. S. (1993). There's more to self-esteem than whether it is high or low: The importance of stability of self-esteem. Journal of Personality and Social Psychology, 65, 1190-1204.

More Than Seven Authors

List by last names and initials; commas separate author names. After the sixth author's name, use an ellipses in place of the author names. Then provide the final author name. There should be no more than seven names. 

Miller, F. H., Choi, M. J., Angeli, L. L., Harland, A. A., Stamos, J. A., Thomas, S. T., . . . Rubin, L. H. (2009). Web site usability for the blind and low-vision user. Technical Communication, 57, 323-335.

Organization as Author

American Psychological Association. (2003).

Unknown Author

Merriam-Webster's collegiate dictionary (10th ed.). (1993). Springfield, MA: Merriam-Webster.

NOTE: When your essay includes parenthetical citations of sources with no author named, use a shortened version of the source's title instead of an author's name. Use quotation marks and italics as appropriate. For example, parenthetical citations of the source above would appear as follows: (Merriam-Webster's, 1993).

Two or More Works by the Same Author

Use the author's name for all entries and list the entries by the year (earliest comes first).

Berndt, T. J. (1981).

Berndt, T. J. (1999).

When an author appears both as a sole author and, in another citation, as the first author of a group, list the one-author entries first.

Berndt, T. J. (1999). Friends' influence on students' adjustment to school. Educational Psychologist, 34, 15-28.

Berndt, T. J., & Keefe, K. (1995). Friends' influence on adolescents' adjustment to school. Child Development, 66, 1312-1329.

References that have the same first author and different second and/or third authors are arranged alphabetically by the last name of the second author, or the last name of the third if the first and second authors are the same.

Wegener, D. T., Kerr, N. L., Fleming, M. A., & Petty, R. E. (2000). Flexible corrections of juror judgments: Implications for jury instructions. Psychology, Public Policy, and Law, 6, 629-654.

Wegener, D. T., Petty, R. E., & Klein, D. J. (1994). Effects of mood on high elaboration attitude change: The mediating role of likelihood judgments. European Journal of Social Psychology, 24, 25-43.

Two or More Works by the Same Author in the Same Year

If you are using more than one reference by the same author (or the same group of authors listed in the same order) published in the same year, organize them in the reference list alphabetically by the title of the article or chapter. Then assign letter suffixes to the year. Refer to these sources in your essay as they appear in your reference list, e.g.: "Berdnt (1981a) makes similar claims..."

Berndt, T. J. (1981a). Age changes and changes over time in prosocial intentions and behavior between friends. Developmental Psychology, 17, 408-416.

Berndt, T. J. (1981b). Effects of friendship on prosocial intentions and behavior. Child Development, 52, 636-643.

Introductions, Prefaces, Forewords, and Afterwords

Cite the publishing information about a book as usual, but cite Introduction, Preface, Foreword, or Afterword (whatever title is applicable) as the chapter of the book.

Funk, R., & Kolln, M. (1998). Introduction. In E. W. Ludlow (Ed.), Understanding English grammar (pp. 1-2). Needham, MA: Allyn and Bacon.

 by Chelsea Lee

Academic writing is full of little conventions that may seem opaque to the uninitiated. One of these is the Latin phrase et al., an abbreviation meaning “and others.” It is used to shorten lists of author names in text citations to make repeated referencing shorter and simpler. Note that et al. is italicized in this post when I am using it as a linguistic example, but it should not be italicized when you are using it as part of a reference citation.

General Use of Et Al.

Below is a chart showing when to use et al., which is determined by the number of authors and whether it is the first time a reference has been cited in the paper. Specifically, articles with one or two authors include all names in every in-text citation; articles with three, four, or five authors include all names in the first in-text citation but are abbreviated to the first author name plus et al. upon subsequent citations; and articles with six or more authors are abbreviated to the first author name plus et al. for all in-text citations.

Number of authors

First text citation (either parenthetical or narrative)

Subsequent text citations (all)

One or two

Palmer & Roy, 2008

Palmer & Roy, 2008

Three, four, or five

Sharp, Aarons, Wittenberg, & Gittens, 2007

Sharp et al., 2007

Six or more

Mendelsohn et al., 2010

Mendelsohn et al., 2010


Avoiding Ambiguity

However, sometimes abbreviating to the first author name plus et al. can create ambiguity. Here are two example references, as also discussed in a previous post about reference twins.

Marewski, J. N., Gaissmaier, W., & Gigerenzer, G. (2010). Good judgments do not require complex cognition. Cognitive Processing, 11, 103–121. doi:10.1007/s10339-009-0337-0
Marewski, J. N., Gaissmaier, W., Schooler, L. J., Goldstein, D. G., & Gigerenzer, G. (2010). From recognition to decisions: Extending and testing recognition-based models for multi-alternative inference. Psychonomic Bulletin & Review, 17, 287–309. doi:10.3758/PBR.17.3.287

The first in-text citations to each of these would be as follows:

  • (Marewski, Gaissmaier, & Gigerenzer, 2010)
  • (Marewski, Gaissmaier, Schooler, Goldstein, & Gigerenzer, 2010)

For the subsequent in-text citations we would usually abbreviate these studies to the first author name plus et al.; however, doing so here would produce two Marewski et al. (2010) citations, leaving the reader unable to tell which one you mean (if the citations were from different years we would not have this problem, because the years would tell them apart). The solution here is to spell out as many names as necessary (here, to the third name) upon subsequent citations to tell the two apart: 

  • (Marewski, Gaissmaier, & Gigerenzer, 2010)
  • (Marewski, Gaissmaier, Schooler, et al., 2010)

Notice that for the first reference, this means that all citations to this source include all three names. For the second reference, the two remaining names can be abbreviated to et al.

A Quirk of Et Al.

Finally, be careful of a quirk of et al., which is that it is plural—that is, it must replace at least two names (or, put another way, it cannot stand for only one name). So, if you have worked through a reference and only one name is left to abbreviate, you must spell out all the names every time to tell the two apart.  Here is an example with three authors, although the principle holds no matter how many total authors there are:

Berry, C. J., Henson, R. N. A., & Shanks, D. R. (2006). On the relationship between repetition priming and recognition memory: Insights from a computational model. Journal of Memory and Language, 55, 515–533. doi:10.1016/j.jml.2006.08.008
Berry, C. J., Shanks, D. R., & Henson, R. N. A. (2006). On the status of unconscious memory: Merikle and Reingold (1991) revisited. Journal of Experimental Psychology: Learning, Memory, and Cognition, 32, 925–934. doi:10.1037/0278-7393.32.4.925

The correct in-text citations would be written as follows for all citations of these two references:

  • (Berry, Henson, & Shanks, 2006)
  • (Berry, Shanks, & Henson, 2006)

Avoid the following common incorrect ways of citing these references in text:

  • (Berry, Henson, et al., 2006), (Berry et al., 2006a)
  • (Berry, Shanks, et al., 2006), (Berry et al., 2006b)

A Final Note

If it happens that all the author names are exactly the same and the studies were published in the same year as well, the method of citation described in the reference twins post applies. Namely, use et al. as usual but also include lowercase letters after the year (2010a, 2010b, etc.) to tell the references apart.

For more information and examples on citing references in text, see Chapter 6 of our sixth edition Publication Manual (pp. 174–179). You may also be interested in our primer on how in-text citations work and our piece on common et al.-related errors.

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