1. Brueckner, A. (1998). Deductive closure principles. In E. Craig (Ed.), Routledge encyclopedia of philosophy. London: Routledge. Retrieved October 21, 2006, from http//www.rep.routledge.com/article/P011.
2. Carroll, L. (1895). What the tortoise said to Achilles. Mind, 4(14), 278–280.
3. David, M., & Warfield, T. (forthcoming A). Closure principles and skeptical arguments. In Q. Smith (Ed.), Epistemology: new essays. Oxford: Oxford University Press.
4. David, M., & Warfield, T. (forthcoming B). Six possible counterexamples to one or two epistemic closure principles.
5. DeRose, K. (1999). Introduction: Responding to scepticism. In K. DeRose & T. A. Warfield (Eds.), Scepticism––a contemporary reader (pp. 1–24). Oxford: Oxford University Press.