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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).
Citing six or more authors APA Manual 6.12 (p. 175)Cite the last name of the first author followed by et al. and the publication date the first time you refer to a work and in each new paragraph. If you cite the work again in the same paragraph, do not include the year of publication. Knight et al.