1. Bonjour, L., The Structure of Empirical Knowledge, Harvard University Press, 1985.
2. Steup, M., and E. Sosa (eds.), Contemporary Debates in Epistemology, Blackwell, 2005.
3. Audi, R., Epistemology, Routledge, 1998.
4. Fumerton, R., Epistemology, Blackwell, 2006.
5. Fumerton, R., ‘Foundationalist Theories of Epistemic Justification’, The Stanford Encyclopedia of Philosophy, Edward N. Zalta (ed.), 2006, URL = http://plato.stanford.edu/archives/spr2006/entries/justep-foundational .