How do I cite a resource by three to five authors in APA Style?
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.