APA (7th ed.) Citation

Harris, T. A. (1977). I'm OK--you're OK (U.S. ed.). Avon Books.

Chicago Style (17th ed.) Citation

Harris, Thomas Anthony. I'm OK--you're OK. U.S. ed. New York: Avon Books, 1977.

MLA (9th ed.) Citation

Harris, Thomas Anthony. I'm OK--you're OK. U.S. ed. Avon Books, 1977.