Cita APA (7a ed.)

Lewis, N. D. (1947). The Practice of Group Therapy. The Pushkin press.

Cita Chicago Style (17a ed.)

Lewis, Nolan D.C. The Practice of Group Therapy. London: The Pushkin press, 1947.

Cita MLA (9a ed.)

Lewis, Nolan D.C. The Practice of Group Therapy. The Pushkin press, 1947.