Παραπομπή APA

Pollak, O. (1976). Human behavior and the helping professions. Spectrum Publications Inc.

Παραπομπή Chicago Style

Pollak, Otto. Human Behavior and the Helping Professions. New York: Spectrum Publications Inc, 1976.

Παραπομπή MLA

Pollak, Otto. Human Behavior and the Helping Professions. Spectrum Publications Inc, 1976.