Encyclopedia of Classical Philosophy. D. Zeyl. Westport, CT: Greenwood, 1997. Tisch Reference B163.E531 1971
A History of Greek Philosophy. W. K. C. Guthrie .Cambridge/New York: Cambridge University Press, 1962-1981. Tisch Book Stacks B171. G83
Oxford Bibliographies. Greek Philosophy.
Oxford Bibliographies. Pre-Socratic Philosophy.
Oxford Bibliographies. Roman Philosophy.
Oxford Companion to Philosophy.