Hudson, W. D. (1973). The is-ought question: A collection of papers on the central problem in moral philosophy (Repr.). Macmillan.
Citazione stile Chigago Style (17a edizione)Hudson, W. D. The Is-ought Question: A Collection of Papers on the Central Problem in Moral Philosophy. Repr. London [u.a.]: Macmillan, 1973.
Citatione MLA (8a ed.)Hudson, W. D. The Is-ought Question: A Collection of Papers on the Central Problem in Moral Philosophy. Repr. Macmillan, 1973.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.