Carkhuff, R. R., & Anthony, W. A. (1979). The skills of helping: An introduction to counseling skills. Human Resource Development Press.

Carkhuff, Robert R., and William Alan Anthony. The Skills of Helping: An Introduction to Counseling Skills. Amherst, Mass.: Human Resource Development Press, 1979.

Carkhuff, Robert R., and William Alan Anthony. The Skills of Helping: An Introduction to Counseling Skills. Human Resource Development Press, 1979.