Cita APA (7a ed.)

Okun, B. F. (1992). Effective helping: Interviewing and counseling techniques (4th ed.). Brooks-Cole.

Cita Chicago Style (17a ed.)

Okun, Barbara F. Effective Helping: Interviewing and Counseling Techniques. 4th ed. Pacific Grove, California: Brooks-Cole, 1992.

Cita MLA (9a ed.)

Okun, Barbara F. Effective Helping: Interviewing and Counseling Techniques. 4th ed. Brooks-Cole, 1992.