APA (7th ed.) Citation

Hughes, G., Welfare, S., & Conquest, R. (1990). Red empire: The forbidden history of the USSR. Weidenfeld and Nicolson.

Chicago Style (17th ed.) Citation

Hughes, Gwyneth, Simon Welfare, and Robert Conquest. Red Empire: The Forbidden History of the USSR. London: Weidenfeld and Nicolson, 1990.

MLA (8th ed.) Citation

Hughes, Gwyneth, et al. Red Empire: The Forbidden History of the USSR. Weidenfeld and Nicolson, 1990.