- National Institute of Mental Health: Obsessive-compulsive disorder (OCD)
- OCD Online
- International Obsessive-Compulsive Foundation Updated
- Obsessive-Compulsive Disorder and Tic Disorders from Duke Health Updated
- "OCD and Tourette Syndrome: Re-examining the Relationship" by Charles S. Mansueto, PhD of the International OCD Foundation New
- OCD Center of Los Angeles
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