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Williams, Michael. (1992). Unnatural doubts: Epistemological realism and the basis of skepticism. Oxford, Blackwell. [more info] [buy book]
Wittgenstein, L. (1958). Philosophical Investigations, Third Edition. Englewood Cliffs, NJ, Prentice-Hall. [more info] [buy book]
Zusne, Leonard (1984). Biographical dictionary of psychology. Westport, CT: Greenwood Press. [more info] [buy book]
Zusne, Leonard (1987). Eponyms in psychology. Westport, CT: Greenwood Press. [more info] [buy book]