APA

Harris T. A., . (1973). I'm OK, you're OK: a practical guide to transactional analysis. New York: Avon books.

Chicago

Harris Thomas Anthony, . 1973. I'm OK, you're OK: a practical guide to transactional analysis. New York: Avon books.

Harvard

Harris T. A., . (1973). I'm OK, you're OK: a practical guide to transactional analysis. New York: Avon books.

MLA

Harris Thomas Anthony, . I'm OK, you're OK: a practical guide to transactional analysis. New York: Avon books. 1973.