APA (7th ed.) Citation

Karoly, P., & Steffen, J. J. (1980). Improving the long-term effects of psychotherapy: Models of durable outcome. Gardner Press.

Chicago Style (17th ed.) Citation

Karoly, Paul, and John J. Steffen. Improving the Long-term Effects of Psychotherapy: Models of Durable Outcome. New York [u.a.]: Gardner Press, 1980.

MLA (9th ed.) Citation

Karoly, Paul, and John J. Steffen. Improving the Long-term Effects of Psychotherapy: Models of Durable Outcome. Gardner Press, 1980.