Liebert, R. M. (1998). Liebert and Spiegler's personality: Strategies and issues (8th ed.). Brooks/Cole.
Citazione stile Chigago Style (17a edizione)Liebert, Robert M. Liebert and Spiegler's Personality: Strategies and Issues. 8th ed. Pacific Grove, CA: Brooks/Cole, 1998.
Citatione MLA (9a ed.)Liebert, Robert M. Liebert and Spiegler's Personality: Strategies and Issues. 8th ed. Brooks/Cole, 1998.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.