Answered By: Theresa Bell Last Updated: Dec 05, 2017 Views: 2556
Cite all the authors in the first reference citation, but “in subsequent citations, include only the surname of the first author followed by et al. (not italicized and with a period after al)” (American Psychological Association, 2010, p. 175).
First citation of source: The study concluded that the sky is not actually blue (Smith, Robertson, & White, 1999, p. 14).
Second citation of source: Smith et al. (1999) further concluded that clouds are not actually white (p. 16).
Reference list entry:
Smith, A., Robertson, B., & White, C. (1999). What colour is your sky? Victoria, Canada: Authors.
For other information regarding citing works by multiple authors, please see "How do I cite a resource by two authors in APA Style?" and "How do I cite a resource with six or more authors in APA Style?".
American Psychological Association. (2010). Publication manual of the American Psychological Association (6th ed.). Washington, DC: Author.