• Art Libraries.Net: virtual catalogue for art history, searches a number of catalogues and systems, from research institutes and libraries, educational institutions, museums and exhibition centres to specialist union catalogues, online bibliographies and other relevant databases. Further information about this service can be accessed here.
  • Art Libraries Network Florence - Munich - Rome, a union catalogue for the Kunsthistorisches Institut in Florenz, Max-Planck-Institut (Florence), Zentralinstitut für Kunstgeschichte (Munich) and Bibliotheca Hertziana, Max Planck Institute for Art History (Rome).
  • Bibliothèque nationale de France.
  • The European Library, searches the content of European national libraries.
  • IRIS (Associazione di Biblioteche Storico-Artistiche e Umanistiche a Firenze), comprises such libraries as Biblioteca Berenson - Villa I Tatti, Biblioteca degli Uffizi and Biblioteca dell'Opificio delle Pietre Dure.
  • KUBIKAT, the collective catalogue of four of the leading German scholarly research institutes in the field of art history: Kunsthistorisches Institut in Florence, Max-Planck-Institut, Zentralinstitut für Kunstgeschichte in Munich, Deutsches Forum für Kunstgeschichte / Centre allemand d'histoire de l'art in Paris and Bibliotheca Hertziana, Max Planck-Institut für Kunstgeschichte in Rome.
  • URBS (Unione Romana Biblioteche Scientifiche), comprises such libraries as those of the British School at Rome and the Ecole française de Rome.
  • WorldCat, searches the collections of more than 10 000 libraries worldwide.