Examples below by Timothy McAdoo, Documentation and Training Specialist, APA PsycINFO, in his blog post How to Cite a Psychological Test in APA Style.
Purring, A. (2012). Charisma and Tenacity Survey [Measurement instrument]. Retrieved from http://www.apa.org/tests/measures/instruments/surveys/charisma.html
Barks, H., & Howls, I. (2013).Directions of Generosity [Database record]. Retrieved from The McAdoo Database of Fictional Titles. http://dx.doi.org/62.2366/34-28.466
Purring, A. (2012). Charisma and Tenacity Survey [Measurement instrument]. Petland, MD: E & K Press.