Association for Psychological Type International (APTi) 800-847-9943 www.aptinternational.org
Center for Applications of Psychological Type (CAPT) 800-777-2278 www.capt.org
CPP, Inc. 800-624-1765 www.cpp.com
The Myers and Briggs Foundation www.myersbriggs.org
MBTI® Master Practitioner Referral Network www.mbtiReferralNetwork.org