- Oxford Reference Online
Provides access to Oxford University Press dictionaries and other reference resources on a wide variety of topics including arts, computing, history, languages, law, literature and quotations, religion, sciences, and social sciences.
- Gale Virtual Reference Library
This is a database of encyclopedias, almanacs, and specialized reference sources for multidisciplinary research.
- Credo Reference
Searches over 275 reference works from some 57 publishers.