Bibliotheca Hertziana
Bildarchiv Foto Marburg
Frick Art Reference Library
Institut National d’Histoire de l’Art
National Gallery of Art
RKD – Netherlands Institute for Art History
Warburg Institute
Courtauld Institute of Art
Federico Zeri Foundation
Getty Research Institute
Kunsthistorisches Institut in Florenz
Paul Mellon Centre
Villa I Tatti - The Harvard University Center for Italian Renaissance Studies
Yale Center for British Art
