APA (7th ed.) Citation

Harris, T. A. (1969). I'm OK, you're OK: A practical guide to transactional analysis. Harper & Row.

Chicago Style (17th ed.) Citation

Harris, Thomas Anthony. I'm OK, You're OK: A Practical Guide to Transactional Analysis. New York: Harper & Row, 1969.

MLA (9th ed.) Citation

Harris, Thomas Anthony. I'm OK, You're OK: A Practical Guide to Transactional Analysis. Harper & Row, 1969.