1. Ayer AJ 1932Language, Truth and LogicLondon: Penguin
2. Blackburn Simon 1984Spreading The WordOxford: Oxford University Press
3. Blackburn Simon 1993a Errors and the Phenomenology of Value inEssays in Quasi-Realism, New York: Oxford University Press 149 65
4. Blackburn Simon 1993b Attitudes and Contents inEssays in Quasi-Realism, New York: Oxford University Press 182 97
5. Blackburn Simon 1993c (1987 Morals and Modals inEssays in Quasi-Realism, New York: Oxford University Press 52 74