APA (7th ed.) Citation

Hierro Sánchez Pescador, J., Anscombe, G. E. M., & Hudson, W. D. (1969). The is-ought question: A collection of papers on the central problem in moral philosophy. MacMillan [etc.].

Chicago Style (17th ed.) Citation

Hierro Sánchez Pescador, José, Gertrude Elisabeth Margaret Anscombe, and William Donald Hudson. The Is-ought Question: A Collection of Papers on the Central Problem in Moral Philosophy. London [etc.]: MacMillan [etc.], 1969.

MLA (9th ed.) Citation

Hierro Sánchez Pescador, José, et al. The Is-ought Question: A Collection of Papers on the Central Problem in Moral Philosophy. MacMillan [etc.], 1969.