Bibliography One Author Two Works By The Same Author

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.

Each citation style handles this situation a little bit differently! Here are specific examples of how it works in the three major citation styles:

APA Style

Per the APA Manual (6th edition), p. 178:

For In-Text Citations:

Arrange two or more works by the same authors (in the same order) by year of publication. Place in-press citations last. Give the authors’ surnames once; for each subsequent work, give only the date.

Training materials are available (Department of Veterans Affairs, 2001, 2003)

Past research (Gogel, 1990, 2006, in press)

Identify works by the same author (or by the same two or more authors in the same author) with the same publication date by the suffixes a, b, c, and so forth, after the year; repeat the year. The suffixes are assigned in the reference list, where these kinds of references are ordered alphabetically by title (of the article, chapter or complete work).

Several studies (Derryberry & Reed, 2005a, 2005b, in press-a; Rothbart, 2003a, 2003b)

(Stahl, 2011a)

(Stahl, 2011b)

For additional examples and tips on citing multiple sources by the same author in APA Style, check out the APA Style Blog’s posts on How to Cite Multiple Works by the Same Author in a Compilation and How to Cite Articles with the Same Authors and Same Year.

MLA Style

In the Works Cited (Per the MLA Handbook (8th edition), p. 113: To cite two or more works by the same author, give the name in the first entry only. Thereafter, in place of the name, type three hyphens, followed by a period and the title. The three hyphens stand for exactly the same name as in the preceding entry. This sort of label does not affect the order in which the entries appear; works listed under the same name are alphabetized by title.

For in-text citations (Per the MLA Handbook (8th edition), p. 55: Including only the author name and page number in a parenthetical citation is insufficient if more than one work appears under that author's name in the work cited list.  In that case, include a shortened version of the source's title.

For example:

In-text citations:

(Haynes, Noah's Curse 84)

(Haynes, The Last Segregated Hour  57)

Works cited (don't forget to indent the second and subsequent lines):

Haynes, Stephen R. Noah's Curse: The Biblical Justification of American SlaveryOxford University Press, 2007.

---. The Last Segregated Hour: The Memphis Kneel-Ins and the Campaign for Southern Church Desegregation. Oxford University Press, 2012.

For additional examples and tips on multiple sources by the same author in MLA Style, check out the MLA Style Center's "How do I distinguish works by an author that have the same title?

Chicago Style

Per the Chicago Manual of Style (17th edition):

Notes and Bibliography method (see section 14.68: The 3-em dash for one repeated name for caveats please refer to 14.67).

For successive entries [in a bibliography] by the same author, editor, translator, or compiler, a 3-em dash (followed by a period or comma, depending on the presence of an abbreviation such as ed.) replaces the name after the first appearance.

For example: (don't forget to indent the second and subsequent lines):

Judt, Tony. A Grand Illusion? An Essay on Europe. New York: Hill and Wang, 1996.

———. Reappraisals: Reflections on the Forgotten Twentieth Century. New Yrok: Penguin Press, 2008.

In a bibliography, titles by the same author are normally listed alphabetically.

Author-Date References (see section 15.18: Chronological order for repeated names in a reference list

For successive entries by the same author(s), translator(s), editor(s), or compiler(s), a 3-em dash replaces the name(s) after the first appearance. The entries are arranged chronologically by year of publication in ascending order, not alphabetized by title. Undated works designated n.d. or forthcoming follow all dated works.

For example: (don't forget to indent the second and subsequent lines):

Schuman, Howard, and Jacqueline Scott. 1987. “Problems in the Use of Survey Questions to  Measure Public Opinion.” Science 236:957-59.

———. 1989. “Generations and Collective Memories.” American Sociological Review 54:359-81.

Two or more works by the same author in the same year must be differentiated by the addition of a, b, and so forth (regardless of whether they were authored, edited, compiled or translated), and are listed alphabetically by title. Text citations consist of author and year plus letter.

Fogel, Robert William. 2004a. The Escape from Hunger and Premature Death, 1700-2100: Europe, America, and the Third World. New York: Cambridge University Press, 2004.

———. 2004b. ”Technophysio Evolution and the Measurement of Economic Growth.” Journal of Evolutionary Economics 14 (2): 217-21. Doi:10.1007/s00191-004-0188-x.          

(Fogel 2004b, 218)

(Fogel 2004a, 45-46)

For additional information on citing multiple sources by the same author in Chicago style, please refer to the Chicago Manual of Style

More information:

For further help please contact the Wolak Learning Center at 603.645.9606 (UC Students) and Online Writing Center at 866.721.1662 (Online/COCE Students) for additional information.

You may also want to consider:

This information is intended to be a guideline, not expert advice. Please be sure to speak to your professor about the appropriate way to cite multiple sources by the same author in your class assignments and projects.


American Psychological Association. (2010). Publication manual of the American Psychological Association. Washington, D.C.: American Psychological Association.

The Modern Language Association of America. (2016). MLA Handbook. New York: Modern Language Association of America.

University of Chicago. (2017). The Chicago Manual of Style. Chicago: University of Chicago Press.

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