1. Audi, Robert (1983): 'Foundationalism, Epistemic Dependence, and Defeasibility', reprinted in (1993): The Structure of Justification, Cambridge: Cambridge University Press.
2. Craig, Edward (1990) Knowledge and the State of Nature, Oxford: Clarendon Press.
3. Goldman, Alvin (1986): Epistemology and Cognition, Cambridge, Mass.: Harvard University Press.
4. Hale, Bob (1987) Abstract Objects, Oxford: Basil Blackwell.
5. Harman, Gilbert (1980) 'Reasoning and Evidence One Does Not Possess', in P. French, et al. (eds) Midwest Studies in Philosophy, vol. 8, Minneapolis: University of Minnesota Press.