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Proper APA format for sources with three to six authors requires listing the last names of all authors the first time you cite the source as well as the publication date. ...results indicated a strong positive correlation between the two variables (Robsen, Hutchkins, Ru, & Selanis, 1989).
Basic APA Citation Style. Basic citations in APA style list the book's information in following order: Author's last name, author's first (and middle, if applicable) initial. (Year of publication). Book title: Subtitle (with the first letter of both title and subtitle capitalized).