APA (7th ed.) Citation

Gross, R., Humphreys, P., & Petkova, B. (1997). Challenges in psychology. Hodder & Stoughton.

Chicago Style (17th ed.) Citation

Gross, Richard, Paul Humphreys, and Bianca Petkova. Challenges in Psychology. London: Hodder & Stoughton, 1997.

MLA (9th ed.) Citation

Gross, Richard, et al. Challenges in Psychology. Hodder & Stoughton, 1997.