Hjelle, L. A., & Ziegler, D. J. (1992). Personality theories: Basic assumptions, research, and applications (3rd.ed.). McGraw-hill.

Hjelle, Larry A., and Daniel J. Ziegler. Personality Theories: Basic Assumptions, Research, and Applications. 3rd.ed. New York: McGraw-hill, 1992.

Hjelle, Larry A., and Daniel J. Ziegler. Personality Theories: Basic Assumptions, Research, and Applications. 3rd.ed. McGraw-hill, 1992.