APA
Harris T. A., . (1977). I'm Ok- you're OK. London: Pan Books Ltd.
Chicago
Harris Thomas A, . 1977. I'm Ok- you're OK. London: Pan Books Ltd.
Harvard
Harris T. A., . (1977). I'm Ok- you're OK. London: Pan Books Ltd.
MLA
Harris Thomas A, . I'm Ok- you're OK. London: Pan Books Ltd. 1977.