APA (7th ed.) Citation

(1973). Personality differences and biological variations: A study of twins (1. ed.). Pergamon Pr.

Chicago Style (17th ed.) Citation

Personality Differences and Biological Variations: A Study of Twins. 1. ed. Oxford u.a: Pergamon Pr, 1973.

MLA (9th ed.) Citation

Personality Differences and Biological Variations: A Study of Twins. 1. ed. Pergamon Pr, 1973.

Warning: These citations may not always be 100% accurate.