APA
Harris T. A., . (1969). I'm ok - you're ok. Pan Books, London: .
Chicago
Harris Thomas A, . 1969. I'm ok - you're ok. Pan Books, London: .
Harvard
Harris T. A., . (1969). I'm ok - you're ok. Pan Books, London: .
MLA
Harris Thomas A, . I'm ok - you're ok. Pan Books, London: . 1969.