Association of Test Publishers http://www.testpublishers.org/
EdITS (Educational and Industrial Testing Service) http://www.edits.net/
Pearson (Formerly Harcourt Assessment)http://www.pearsonclinical.com/
PAR (Pscyhological Assessment Resources, Inc) http://www.parinc.com/
Pro-Ed, Inc. http://www.proedinc.com/
WPS (Western Psychological Services) http://www.wpspublish.com
