APA

De Schill S., International Institute for Mental Health Research & American Mental Health Foundation. (1974). The challenge for group psychotherapy: present and future. New York: International Universities Press.

Chicago

De Schill Stefan, International Institute for Mental Health Research and American Mental Health Foundation. 1974. The challenge for group psychotherapy: present and future. New York: International Universities Press.

Harvard

De Schill S., International Institute for Mental Health Research and American Mental Health Foundation. (1974). The challenge for group psychotherapy: present and future. New York: International Universities Press.

MLA

De Schill Stefan, International Institute for Mental Health Research and American Mental Health Foundation. The challenge for group psychotherapy: present and future. New York: International Universities Press. 1974.