- International OCD Foundation (IOCDF)
- Anxiety and Depression Association of America (ADAA)
- Association for Behavioral and Cognitive Therapies (ABCT)
- Trichotillomania Learning Center (TLC)
- Tourette Syndrome Association (TSA)
- Peace of Mind Foundation
Books and Articles
- International OCD Foundation (IOCDF) Book List
- “In Search of the Elusive Behavior Therapist” by Fred Penzel, Ph.D.
- “Getting the Right Treatment for Obsessive-Compulsive Disorder” by Fred Penzel, Ph.D.