APA (7th ed.) Citation

Flett, G. L., & Hewitt, P. L. (2002). Perfectionism: Theory, research, and treatment. American Psychological Association.

Chicago Style (17th ed.) Citation

Flett, Gordon L., and Paul L. Hewitt. Perfectionism: Theory, Research, and Treatment. Washington, DC: American Psychological Association, 2002.

MLA (9th ed.) Citation

Flett, Gordon L., and Paul L. Hewitt. Perfectionism: Theory, Research, and Treatment. American Psychological Association, 2002.