The below reference resources can be consulted, but cannot be used as one of your resources on your paper. The bibliographies included in reference entries can lead you to solid sources. Wikipedia and other general web-based sources are not appropriate for your bibliography.
Search Grove Art Online and other Oxford art reference resources in one location. Includes access to additional Oxford art titles, including the Encyclopedia of Aesthetics and the Oxford Companion to Western Art.
Encyclopedia of Aesthetics, 2nd Ed. by 
Encyclopedia of Native American Artists by 
Historical art index, A.D. 400-1650 : people, places, and events depicted by 