WikiProject PCC Wikidata Pilot/Frick Art Reference Library
WikiProject PCC Wikidata Pilot — Smithsonian Libraries — Artists Files
reproduction right represented by CISAC-member
Smithsonian American Art and Portrait Gallery Library
San Francisco Museum of Modern Art online collection
Archives Directory for the History of Collecting in America
Catalogue of the Unione Romana Biblioteche Scientifiche
National Library of Israel Names and Subjects Authority File