Check the APA Style blog for tips at
http://blog.apastyle.org/apastyle/2014/02/how-to-cite-a-psychological-test-in-apa-style.html
From a website
In-text citation
“In this study, we used Cooper, Taylor, Cooper and Fairburn (1987) Body Shape Questionnaire rather than Franzoi and Shield (1984) Body Esteem Scale.”
Reference List
Franzoi, S. L. & Shields, S.A. (1984). The Body-Esteem Scale [Measurement instrument]. Retrieved from
http://www.marquette.edu/psyc/facstaff_franzoi_ scale.shtml
Format:
Author Surname, Initial(s). (Date). Title of Measurement [Format]. Retrieved from URL
From the University of Lincoln Psychology collection (or other paper source):
Bene, E., & Anthony, J. (1985). Family Relations Test: Children’s Version [Measurement instrument]. Windsor: NFER- Nelson Publishing Company