APA (7th ed.) Citation

Sidgwick, H., & Widgery, A. G. (1967). Outlines of the history of ethics for English readers (6th ed. (enl.), repr.). Macmillan.

Chicago Style (17th ed.) Citation

Sidgwick, Henry, and Alban G. Widgery. Outlines of the History of Ethics for English Readers. 6th ed. (enl.), repr. London [etc.]: Macmillan, 1967.

MLA (9th ed.) Citation

Sidgwick, Henry, and Alban G. Widgery. Outlines of the History of Ethics for English Readers. 6th ed. (enl.), repr. Macmillan, 1967.