Cita APA (7a ed.)

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.].

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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