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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).
When using APA format, follow the author-date method of in-text citation. This means that the author's last name and the year of publication for the source should appear in the text, E.g., (Jones, 1998), and a complete reference should appear in the reference list at the end of the paper.