APA (7th ed.) Zitazioa
Langs, R. (1998). Ground rules in psychotherapy and counselling. Karnac Books.
Chicago Style (17th ed.) Zitazioa
Langs, Robert. Ground Rules in Psychotherapy and Counselling. London: Karnac Books, 1998.
MLA (9th ed.) Zitazioa
Langs, Robert. Ground Rules in Psychotherapy and Counselling. Karnac Books, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.