1. An Enquiry Concerning the Principles of Morals, L. A. Selby-Bigge, ed., Oxford University Press, 1957, pp.287-8.

2. John Mackie, Ethics:Inventing Right and Wrong, Penguin books, 1977, p. 41.

3. Thomas Nagel, "The Limits of Objectivity" in The Tanner Lectures on Human Values, ed. Sterling McMurrin, University of Utah Press, 1980, pp.100-101.

4. R. M. Hare, Applications of Moral Philosophy, London, 1972.

5. Simon Blackburn, "Errors and the Phenomenology of Value", in Morality and Objectivity, ed. Ted Honderich, Routledge and Kegan Paul, 1985, p. 8.

6. Op. cit., p. 29

7. David Wiggins, "Truth, Invention, and the Meaning of Life", Proceedings of the British Academy LXII (1976), pp. 348-49.

8. John McDowell, "Values and Secondary Qualities", in Morality and Objectivity, ed.,Ted Honderich, Routlege and Kegan Paul, 1985, p. 118.

9. Bruce Chatwin, In Patagonia, Summit Books, 1977, pp.135-6.