Paintings in Museums and Public Art Galleries:
National Galleries of Scotland, Edinburgh
The Royal Collection, London, UK (Zoomable - look for the magnifying glass and the text "Magnify image") A prophet or philosopher, ca.1550-60
Art Fund for UK Museums
Drawings from the Biblioteca Ambrosiana, Milan
State Museums of Florence Digital Archive, Italy
Virtual Uffizi
Professional Tools:
Artprice
Pictures from Image Archives:
Brusasorci in the Web Gallery of Art 
Ciudad de la Pintura (in Spanish) 
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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