Cita APA (7th ed.)

Harris, T. A. (1973). I'm OK -- you're OK. Pan Books Ltd., Avon Books..

Cita Chicago (17th ed.)

Harris, Thomas Anthony. I'm OK -- You're OK. London : New York: Pan Books Ltd., Avon Books., 1973.

Cita MLA (8th ed.)

Harris, Thomas Anthony. I'm OK -- You're OK. Pan Books Ltd., Avon Books., 1973.