Author, A. (year). Name of Test or Inventor y [Database record]. Retrieved from Database Name. http://dx.doi.org/xxxxx
Notes
You are citing the database record, not necessarily the test itself.
More Examples
Author, A. (year). Name of Test or Inventor y [Database record]. Retrieved from Database Name. http://dx.doi.org/xxxxx
Juniper, E. F., Guyatt, G. H., Feeny, D. H., Ferrie, P. J., Griffith, L. E., & Townsend, M. (1996). Paediatric Asthma Quality of Life Questionnaire . Retrieved from PsycTESTS. http://dx.doi.org/10.1037/t05800-000
Author, A., Author, B., & Author, C. (year). Title of test or inventory (Version) [Format if necessary]. Unpublished Instrument. Retrieved from http://xxxxx
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Author, A., Author, B., & Author, C. (year). Title of test or inventory (Version) [Format if necessary]. Unpublished Instrument. Retrieved from http://xxxxx
Kincaid,D., Childs, K., & George, H. (2010). School-wide benchmarks of quality (Revised). Unpublished instrument. Retrieved from http://flpbs.fmhi.usf.edu/pdfs/EndYearEval20112012bundled.pdf
Tunon, J., & Brydges, B. (2014). Subjective rubric [Software and training videos]. Unpublished instrument. Retrieved from http://www.nova.edu/fsehs/arc/testlibrary/tunon