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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).
APA Author Names. In your paper's references list, if the author's name is James Lyndon Smith, list the author's first, middle and last name as follows: Smith, J.L. If the publication has two authors, James Lyndon Smith and Terrance Miles Jones, list the authors' names as follows: Smith, J.L., & Jones, T.M.