1. John Wisdom,Paradox and Discovery, Philosophical Library, New York, 1965, p. 102
2. P.F.Strawson,Individuals, Methuen and Co. Ltd., London, 1959, p. 11
3. A.J.Ayer, The Problem of Knowledge, Macmillan and Co. Ltd., London, 1956, pp. 5–9
4. J.S. Mill,A System of Logic, Longmans, Green and Co. Ltd., London, 1947, pp. 23–4
5. Renford Bambrough, ‘Universals and Family Resemblances’,Proceedings of the Aristotelian Society, 1960–61, pp. 207–22