Citazione Stile APA (7a Edizione)

Okun, B. F. (1987). Effective helping interviewing and counseling techniques (3rd ed.). Brooks/Cole.

Citazione stile Chigago Style (17a edizione)

Okun, Barbara F. Effective Helping Interviewing and Counseling Techniques. 3rd ed. Monterey, Calif: Brooks/Cole, 1987.

Citatione MLA (9a ed.)

Okun, Barbara F. Effective Helping Interviewing and Counseling Techniques. 3rd ed. Brooks/Cole, 1987.