Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.