APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

Liebert, Robert M., en Michael D. Spiegler. Personality: Strategies and Issues. 6th ed. Pacific Grove, Calif: Brooks/Cole, 1990.

MLA (9e ed.) Bronvermelding

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