MLA

Perls, Frederick S. The Gestalt Approach & Eye Witness to Therapy. 5e ed. New York: Bantam Books, 1981.

APA

Perls, F. S. (1981). The gestalt approach & Eye witness to therapy. 5e ed. New York: Bantam Books.

Chicago

Perls, Frederick S., The Gestalt Approach & Eye Witness to Therapy. 5e ed. New York: Bantam Books, 1981.