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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).
Concise rules of APA style (6th ed.). Washington, DC: Author. When there is no author or editor listed for the publication, the title of the book or article moves into the author position. Do not use Anonymous as the author, unless Anonymous is specifically listed as the author.