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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).
Generally, APA in-text citation is written with the last name of the author and year of publication separated by a comma inside the parentheses. If the name of the author is part of the narrative, only the year is enclosed in parentheses. Table of Content. 1 Work by One Author.