APA (7th ed.) Citation

Claridge, G., Canter, S., Hume, W. I., Claridge, G. S., & Hume, W. I. (1973). Personality differences and biological variations: A study of twins International series of monographs on experimental psychology.

Chicago Style (17th ed.) Citation

Claridge, Gordon, Sandra Canter, Wilfrid I. Hume, Gordon S. Claridge, and Wilfred I. Hume. "Personality Differences and Biological Variations: A Study of Twins." International Series of Monographs on Experimental Psychology 1973.

MLA (8th ed.) Citation

Claridge, Gordon, et al. "Personality Differences and Biological Variations: A Study of Twins." International Series of Monographs on Experimental Psychology, 1973.