Reference Universe -- "searching deeply into the indexes of more than 50,000 electronic and print specialized reference works from over 750 publishers."
See also Oxford Scholarship Online
The UCF Libraries provide online access to a variety of encyclopedias, dictionaries, and other reference resources. Consider entries from some of these works to explain fundamental concepts or to clarify specific topics.
The guide for Encyclopedias, Dictionaries & Handbooks identifies all of the online books available in the following library databases:
A sampling of titles from the NetLibrary database is listed, but please note that titles in the NetLibrary database should not be assigned for classroom reading assignments because only one person at a time can access a specific NetLibrary title.
See also the Synthesis series.