Cita APA (7a ed.)

Ryckman, R. M. (1993). Theories of personality (5th ed.). Brooks-Cole.

Cita Chicago Style (17a ed.)

Ryckman, Richard M. Theories of Personality. 5th ed. Pacific Grove, California: Brooks-Cole, 1993.

Cita MLA (9a ed.)

Ryckman, Richard M. Theories of Personality. 5th ed. Brooks-Cole, 1993.