APA (7th ed.) Citation

White, T. H., & Garnett, D. (1968). The White/Garnett letters. Viking Press.

Chicago Style (17th ed.) Citation

White, T. H., and David Garnett. The White/Garnett Letters. New York: Viking Press, 1968.

MLA (9th ed.) Citation

White, T. H., and David Garnett. The White/Garnett Letters. Viking Press, 1968.