1. Locke on abstraction: A response to M. R. Ayers
2. Berkeley's Doctrine of Notions and Theory of Meaning
3. Russell, Bertrand. 1992. Logic and Knowledge. London: Routledge
4. Skorupski, John. 1989. John Stuart Mill. London: Routledge
5. Russell, Bertrand. 1983. The Collected Papers of Bertrand Russell. 8 vols. Edited by Elisabeth Eames and Kenneth Blackwell. London: Allen and Unwin