The practice of group therapy

MLA

Lewis, Nolan D. C., and S. R Slavson. The Practice of Group Therapy. New York: International Universities Press, 1947.

APA

Lewis, N. D. C., & Slavson, S. R. (1947). The practice of group therapy. New York: International Universities Press.

Chicago

Lewis, Nolan D. C., The Practice of Group Therapy. Edited by S. R Slavson. New York: International Universities Press, 1947.