Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.