Cita APA (7th ed.)
Hackney, H. L. (2009). The professional counselor. Pearson Education Ltd.
Cita Chicago (17th ed.)
Hackney, Harold L. The Professional Counselor. New Jersey: Pearson Education Ltd, 2009.
Cita MLA (9th ed.)
Hackney, Harold L. The Professional Counselor. Pearson Education Ltd, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.