APA (7th ed.) Citation

Upton, D., Upton, P., & Kay, D. (2011). Test yourself: Personality and individual differences. Learning Matters.

Chicago Style (17th ed.) Citation

Upton, Dominic, Penney Upton, and Daniel Kay. Test Yourself: Personality and Individual Differences. Exeter: Learning Matters, 2011.

MLA (9th ed.) Citation

Upton, Dominic, et al. Test Yourself: Personality and Individual Differences. Learning Matters, 2011.