APA-viite (7. p.)

Perls, F. S. (1969). Ego, hunger, and aggression: The beginning of gestalt therapy. Random House.

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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