Harris, Thomas A. I'm OK - you're OK / I am OK - You are OK Thomas A. Harris. - London : Penguin Books, ©1973 - 269 p. ; 21 cm. Includes index. ISBN: 9780099557555 Subjects--Topical Terms: Transactional analysisMental healthPsychotherapy Dewey Class. No.: 616.89145 / HAR