Encyclopaedia of Judaism.- This link opens in a new window
Edited by Jacob Neusner, Alan J. Avery-Peck, and William Scott Green.
2nd edition. Boston: Brill, 2005. 4 volumes.
This encyclopedia is specifically about the religious aspects of Judaism; it does not include articles on non-religious historical or cultural aspects. Each of the 230 articles is an in-depth essay on a particular topic.