APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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