Cita APA (7a ed.)

Lester, D., & Brockopp, G. W. (1976). Crisis intervention and counseling by telephone. Charles C. Thomas.

Cita Chicago Style (17a ed.)

Lester, David, y Gene W. Brockopp. Crisis Intervention and Counseling by Telephone. Springfield, Illinois: Charles C. Thomas, 1976.

Cita MLA (9a ed.)

Lester, David, y Gene W. Brockopp. Crisis Intervention and Counseling by Telephone. Charles C. Thomas, 1976.