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American Psychological Association (APA): Second Work(s) By Same Author

When listing two or more works by the same author in your reference list, the work with the earlier publication date should come first:

If the publication date is the same, then the entries should appear alphabetically by title (excluding "A" or "The"). Lowercase letters ("a," "b," "c," etc.) are placed immediately after the year, within the parentheses:

For more specific information, consult the Publication Manual of the American Psychological Association (Fifth Edition) or see the APA style website.