Cita APA

Okun, B. F. (2002). Effective helping: Interviewing and counselling techniques (6th ed.). Brooks/Cole.

Chicago Edition Citation

Okun, Barbara F. Effective Helping: Interviewing and Counselling Techniques. 6th ed. U.S.A: Brooks/Cole, 2002.

Cita MLA

Okun, Barbara F. Effective Helping: Interviewing and Counselling Techniques. 6th ed. Brooks/Cole, 2002.