If I wanted to cite my use of this tool in a publication, what do I use?

What are the PNT and PRT? 

The Philadelphia Naming Test (PNT) is a 175-item picture naming test developed for the psycholinguistic exploration of lexical access in nonaphasic and aphasic speakers (Roach et al., 1996, Clinical Aphasiology, 24:121-133.). The PNT features in numerous publications, including studies that fit aphasic naming data to the interactive two-step model of naming (Dell et al., 1997, Psychological Review, 104:801-838; Schwartz et al., 2006, Journal of Memory and Language, 54:228-264). The Philadelphia Repetition Test (PRT) tests simple word repetition using the same set of words. More information, including testing and scoring materials and procedures, is available at: http://www.ncrrn.org/assessment/pnt