Perls, F. S., Hefferline, R. F., & Goodman, P. (1951). Gestalt therapy: Excitement and growth in the human personality. Penguin Books.
Citazione stile Chigago Style (17a edizione)Perls, Frederick S., Ralph F. Hefferline, e Paul Goodman. Gestalt Therapy: Excitement and Growth in the Human Personality. [s.l.]: Penguin Books, 1951.
Citatione MLA (9a ed.)Perls, Frederick S., et al. Gestalt Therapy: Excitement and Growth in the Human Personality. Penguin Books, 1951.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.