APA (7th ed.) Citation

Forster, E. M., & Windham, D. (1975). E.M. Forster's letters to Donald Windham. [Sandy Campbell].

Chicago Style (17th ed.) Citation

Forster, E. M., and Donald Windham. E.M. Forster's Letters to Donald Windham. [United States?]: [Sandy Campbell], 1975.

MLA (9th ed.) Citation

Forster, E. M., and Donald Windham. E.M. Forster's Letters to Donald Windham. [Sandy Campbell], 1975.