The Bibliography of the History of Art (BHA) and to the Répertoire international de la littérature de l'art (RILA) cover material published between 1975 and 2007.  The Getty Web site offers access for no charge.  It provides both basic and advanced search modules for BHA and RILA, and they can be searched easily by subject, artist, author, article or journal title, and other elements.  For material published after 2007 see the International Bibliography of Art (IBA).