Cita APA (7th ed.)

Liebert, R. .., & Spiegler,Michael.D. (1990). Personality: Strategies and issues (6th ed.). Brooks/Cole Publishing Co..

Cita Chicago (17th ed.)

Liebert, Robert .M, i Spiegler,Michael.D. Personality: Strategies and Issues. 6th ed. California.: Brooks/Cole Publishing Co., 1990.

Cita MLA (9th ed.)

Liebert, Robert .M, i Spiegler,Michael.D. Personality: Strategies and Issues. 6th ed. Brooks/Cole Publishing Co., 1990.