APA-viite (7. p.)
Langs, R. (1998). Ground rules in psychotherapy and counselling. Karnac Books.
Chicago-viite (17. p.)
Langs, Robert. Ground Rules in Psychotherapy and Counselling. London: Karnac Books, 1998.
MLA-viite (9. p.)
Langs, Robert. Ground Rules in Psychotherapy and Counselling. Karnac Books, 1998.
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