- American Psychological Association
- American Counseling Association
- AmoebaWeb Psychology Directory
- APA PsychPort
- Discovering Psychology (WGBH Educational Foundation)
- Encyclopedia of Psychology
- Mental Health InfoSource
- Mental Help Net
- National Institute of Mental Health
- Scientific American
- 60 Second Psych
Specific Disorders and Mental Health Issues
- Electronic Journal of Human Sexuality
- Guttmacher Institute
- Human Sexuality Resources
- The Kinsey Institute for Research in Sex, Gender, and Reproduction
- International Encyclopedia of Sexuality
- National Sexuality Resource Center
- SIECUS: Sexuality Information & Education Council of the U.S.
- Society for the Psychological Study of Lesbian, Gay, and Bisexual Issues