APA (7th ed.) Citation

Hudson, W. D. (1969). The is-ought question. A collection of papers on the central problem in moral philosophy. Macmillan.

Chicago Style (17th ed.) Citation

Hudson, W. D. The Is-ought Question. A Collection of Papers on the Central Problem in Moral Philosophy. London: Macmillan, 1969.

MLA (9th ed.) Citation

Hudson, W. D. The Is-ought Question. A Collection of Papers on the Central Problem in Moral Philosophy. Macmillan, 1969.