These books provide a general bibliographic overview of the literature of philosophy. For reasons of both quality and currency, Bynagle deserves a first look.
Bertman, Martin A. Research Guide in Philosophy.
Morristown, N.J.: General Learning, 1974.
B 52 .B43 1974
Bynagle, Hans E. Philosophy: A Guide to the Reference
Literature. 3rd ed. Littleton, Colo.: Libraries
Ref. B 72 .B97 2006
De George, Richard T. The Philosopher's Guide to Sources,
Research Tools, Professional Life, and Related Fields. Lawrence,
Kans.: Regents Press of Kansas, 1980.
B 53 .D45 1980
Tice, Terence N., and Thomas P. Slavens. Research Guide
to Philosophy. Chicago: American Library Association, 1983.
B 52 .T5 1983