APA

Hjelle L. A., Ziegler D. J., . (1992). Personality theories. New York: McGraw-Hill.

Chicago

Hjelle Larry A, Ziegler Daniel J, . 1992. Personality theories. New York: McGraw-Hill.

Harvard

Hjelle L. A., Ziegler D. J., . (1992). Personality theories. New York: McGraw-Hill.

MLA

Hjelle Larry A, Ziegler Daniel J, . Personality theories. New York: McGraw-Hill. 1992.