Cita APA (7a ed.)

Claridge, G., Canter, S., & Hume, W. I. (1973). Personality differences and biological variations: A study of twins. Pergamon.

Cita Chicago Style (17a ed.)

Claridge, Gordon, Sandra Canter, y W. I. Hume. Personality Differences and Biological Variations: A Study of Twins. Oxford [etc.]: Pergamon, 1973.

Cita MLA (9a ed.)

Claridge, Gordon, et al. Personality Differences and Biological Variations: A Study of Twins. Pergamon, 1973.