BHA: Bibliography of the History of Art (Indexes books and articles on European and American Art from Antiquity to the Present)
International Bibliography of Art (Continues/Supplements BHA after 2008)
Worldcat (Full OCLC/RLIN Union catalog of books and other materials in academic and public libraries)
Art Discovery Group Catalogue (A virtual library catalogue for art history: gives access to more than 6 million records in various European art libraries)
Google Book Search (Full text of many public domain collections of major research libraries; full text indexing of copyrighted materials)
IRIS Consortium (Union catalogue of a consortium of Florentine art and humanities libraries)
NYArc Arcade (Union catalogue of Frick, MoMA, and Brooklyn Museum libraries)
Worldwide Books (a searchable listing of art exhibition catalogs 1960's-current)
Artbibliographies Modern (Index/Abstract to 20th Century Art)
Nineteenth Century Books on Art and Architecture (a wide-ranging corpus of critical, historical and biographical works on art published in the 19th century in British Collections.)
L'Année philologique (bibliography for classical studies)
Victorian Database Online (References to articles, books and dissertations on every field of nineteenth-century British Studies)
ITER: Gateway to the Renaissance (Bibliography of Medieval and Renaissance Europe from 400-1700)
Bibliography of Asian Studies (Indexes subjects on East, Southeast, and South Asia in Western-language periodicals and books, etc.