APA (7th ed.) Citation

American Psychological Association, Wachtel, P. L., & Messer, S. B. (1997). Theories of psychotherapy: Origins and evolution. American Psychological Association.

Chicago Style (17th ed.) Citation

American Psychological Association, Paul L. Wachtel, and Stanley B. Messer. Theories of Psychotherapy: Origins and Evolution. Washington, DC: American Psychological Association, 1997.

MLA (9th ed.) Citation

American Psychological Association, et al. Theories of Psychotherapy: Origins and Evolution. American Psychological Association, 1997.