Mi-Kyoung Lee (2005) Epistemology after Protagoras: Responses to Relativism in Plato, Aristotle, and Democritus Oxford University Press. Chap.3. Protagoras and relativism. 30-45.

Timothy Williamson (2000) Knowledge and its Limits, Oxford University Press. Chap.1. A State of Mind. 21-48. [here 33-48.]

Timothy Williamson (2000) Knowledge and its Limits, Oxford University Press. Chap.1. A State of Mind. 21-48. [here 21-33.]

Timothy Williamson (2000) Knowledge and its Limits, Oxford University Press. Introduction. 1-20. [here 1-11.]

Timothy Williamson (2000) Knowledge and its Limits Oxford University Press. Chap.2. Broadness. 49-64. 1章では Williamson 自身の基本的な立場が粗描されたが，2章では内在主義的な議論への反論が詳細に行われる．