Hjelle, L. A., & Daniel J Ziegler. (1976). Personality: Theories:basic assumptions, research, and applications (ed.). McGraw-Hill book Co..

Hjelle, Larry A., and Daniel J Ziegler. Personality: Theories:basic Assumptions, Research, and Applications. ed. New york: McGraw-Hill book Co., 1976.

Hjelle, Larry A., and Daniel J Ziegler. Personality: Theories:basic Assumptions, Research, and Applications. ed. McGraw-Hill book Co., 1976.