APA Style

Combs, A, W., Snygg, D. (1959). Individual Behavior : A Perceptual Approach to Behavior, Revised Edition . New York: Harper & Row Publishers.

MLA Style

Combs, Arthur, W.., Snygg, Donald. "Individual Behavior : A Perceptual Approach to Behavior, Revised Edition". New York: Harper & Row Publishers, 1959. Text.