Παραπομπή APA

Hjelle, L. A. Z. (1992). Personality theories (3 edition.). McGraw-Hill International Book Co.

Παραπομπή Chicago Style

Hjelle, Larry A; Ziegler. Personality Theories. 3 edition. Auckland: McGraw-Hill International Book Co, 1992.

Παραπομπή MLA

Hjelle, Larry A; Ziegler. Personality Theories. 3 edition. McGraw-Hill International Book Co, 1992.