Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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