APA (7th ed.) Citation

Cummings, N. A., & Cummings, J. L. (2000). The essence of psychotherapy: Reinventing the art in the new era of data. Academic Press.

Chicago Style (17th ed.) Citation

Cummings, Nicholas A., and Janet L. Cummings. The Essence of Psychotherapy: Reinventing the Art in the New Era of Data. San Diego: Academic Press, 2000.

MLA (9th ed.) Citation

Cummings, Nicholas A., and Janet L. Cummings. The Essence of Psychotherapy: Reinventing the Art in the New Era of Data. Academic Press, 2000.