The Artstor Digital Library now contains over 2 MILLION digital images for use by educators, scholars and students in a wide variety of disciplines.
CAMIO - - The Catalog of Art Museum Images Online — is a growing online collection documenting works of art from around the world representing the collections of many prominent museums. CAMIO includes images of: Architecture, Costume, Decorative Arts, Utilitarian Objects, Drawings, Jewelry, Paintings Photographs, Prints, Sculpture, Textiles, and Watercolors.
Oxford Art Online:
Grove Art Online
The Oxford Companion to Western Art
Encyclopedia of Aesthetics
The Concise Oxford Dictionary of Art Terms