APA (7th ed.) Citation

Waugh, E., Cooper, D., & Cooper, A. (1992). The letters of Evelyn Waugh and Diana Cooper. Ticknor & Fields.

Chicago Style (17th ed.) Citation

Waugh, Evelyn, Diana Cooper, and Artemis Cooper. The Letters of Evelyn Waugh and Diana Cooper. New York: Ticknor & Fields, 1992.

MLA (9th ed.) Citation

Waugh, Evelyn, et al. The Letters of Evelyn Waugh and Diana Cooper. Ticknor & Fields, 1992.