A newly reorganized, up-to-date overview of key reference works in philosophy, this reference guide reflects a veritable explosion of reference sources, both print and online, published over the past decade. Nearly 300 of the 700+ entries consist of new material, with an additional 50 entries substantially revised and updated. English-language sources are emphasized, but important non-English works are also well represented. This handy guide will prove useful for professional philosophers, philosophy educators, and students from beginning to graduate, and librarians.