1. Alston, W. (1989). Epistemic justification. Ithaca: Cornell University Press.
2. Bergmann, M. (2006). Justification without awareness. New York: Oxford University Press.
3. BonJour, L. (2002). Internalism and externalism. In P. Moser (Ed.), The Oxford handbook of epistemology. New York: Oxford University Press.
4. Fumerton, R. (1985). Metaphysical and epistemological problems of perception. Lincoln: University of Nebraska Press.
5. Fumerton, R. (1995). Metaepistemology and skepticism. Lanham: Rowman and Littlefield.