1Laurence BonJour. Can Empirical Knowledge Have a Foundation[A]. in Ernest Sosa Knowledge and Justification[C]. volume Vol. I, Aldeshot: Dartmouth Publishing Company 1994. 262.
2Jack S. Crumley Ⅱ. An Introduction to Epistemology[M]. California: University of San Diego Press, 1999.95,96,99,110,102,114.
3Louis P Pojman. The Theory of Knowledge Classical—and Contemporary Readings (Second edition) [M]. 1999. 189.