Reference books such as encyclopedias, dictionaries, handbooks and biographies help you find factual and background information about your topic.
Google and Wikipedia could be good places to start your search for general and initial ideas about your topic. But you will always have to use Library resources to get more credible information.
Encyclopedias
Dictionaries and Handbooks
Biographies
Chronologies
Internet Sources
For more go to Databases, limit your search by subject to Islamic Studies. Or, search the Library Catalog, do a keyword search for "Islam" AND Encyclopedias or dictionaries AND Islam
Selected Arabic Encyclopedias: