Perls, F. S. (1969). Ego, hunger, and aggression; the beginning of gestalt therapy. Random House.
Cita Chicago Style (17a ed.)Perls, Frederick S. Ego, Hunger, and Aggression; the Beginning of Gestalt Therapy. New York: Random House, 1969.
Cita MLA (9a ed.)Perls, Frederick S. Ego, Hunger, and Aggression; the Beginning of Gestalt Therapy. Random House, 1969.
Precaución: Estas citas no son 100% exactas.