Perls, Frederick S. Ego, hunger, and aggression : the beginning of gestalt therapy / by F. S. Perls. - 273 pages : illustrations ; 22 cm Source: 6.95 Subjects--Personal Names: Freud, Sigmund, 1856-1939 Subjects--Topical Terms: Ego (Psychology)Gestalt therapy. LC Class. No.: BF173. / P46 1969 Dewey Class. No.: 150.1982