APA (7th ed.) Citation

Sidgwick, A., & Sidgwick, E. M. (1906). Henry Sidgwick. Macmillan.

Chicago Style (17th ed.) Citation

Sidgwick, Arthur, and Eleanor Mildred Sidgwick. Henry Sidgwick. London, New York: Macmillan, 1906.

MLA (9th ed.) Citation

Sidgwick, Arthur, and Eleanor Mildred Sidgwick. Henry Sidgwick. Macmillan, 1906.