Cita APA (7a ed.)

Carkhuff, R. R., Anthony, W. A., Cannon, J. R., Pierce, R. M., & Zigon, F. J. (1979). The skills of helping: An introduction to counseling skills (First edition.). Human Resource Development Press.

Cita Chicago Style (17a ed.)

Carkhuff, Robert R., William Alan Anthony, John R. Cannon, Richard M. Pierce, y F. Jack Zigon. The Skills of Helping: An Introduction to Counseling Skills. First edition. Amherst, Massachusetts: Human Resource Development Press, 1979.

Cita MLA (9a ed.)

Carkhuff, Robert R., et al. The Skills of Helping: An Introduction to Counseling Skills. First edition. Human Resource Development Press, 1979.