Use these books (and other reference books), found in the Reference Collection on the first floor of the library,
as a starting place for your research. They are a good
Grove/Oxford Art Online
Search this excellent art & architecture encyclopedia for genres, movements, and people.
Credo is a large collection of encyclopedias and dictionaries on all subjects; it also contains core titles such as the Thames & Hudson Dictionary of Art & Artists
To browse, check out:
O.R. contains reference information on all subjects. For photography, try the "Oxford Companion to the Photograph."