Cita APA (7a ed.)

Perls, F. S. (1969). Ego, hunger and aggression: The beginning of Gestalt therapy. Vintage Books.

Cita Chicago Style (17a ed.)

Perls, Frederick S. Ego, Hunger and Aggression: The Beginning of Gestalt Therapy. New York: Vintage Books, 1969.

Cita MLA (9a ed.)

Perls, Frederick S. Ego, Hunger and Aggression: The Beginning of Gestalt Therapy. Vintage Books, 1969.