Paintings in Museums and Public Art Galleries:
J. Paul Getty Museum, Los Angeles Alexander Ceding Campaspe to Apelles, 1819
Norton Simon Museum, Pasadena, California
Joconde Database of French Museum Collections (in French) 
Musée des Augustins, Toulouse, France
Professional Tools:
Artprice
Pictures from Image Archives:
Jerome-Martin Langlois in the Art Renewal Center
Jerome-Martin Langlois in the Web Gallery of Art 
Articles:
Union List of Artist Names (Getty Museum) Reference sheet with basic information about the artist and pointers to other references.
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