Web directories vary in restrictiveness, but all have some rating system for site inclusion. Another highly regarded web directory is the Librarian's Index to the Internet . ArtSearch is a search engine devoted to art history. This site links to Baroque Art of Holland and Flanders , Baroque Art of Italy and Spain , and Baroque Art of England and France . See also Art History Resources on the Web or Worldwide Arts Resources for links to museums whose collections may in part be represented online.
Some museums provide research bibliographies for works in their collection.
One such museum is the National Gallery of Art . Style guides for composing a bibliography Trexler Library's Style Guides offer models for citing both print and web sources in a bibliography.