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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).
According to the 6th edition of the APA manual, The names of the authors should appear in the order of their contributions, centered between the side margins. For names with suffixes (e.g., Jr. and III), separate the suffix from the rest of the name with a space instead of a comma.