Paintings in Museums and Public Art Galleries:
Pierpont Morgan Library, New York City Adoration of the Magi, and Solomon Adored by the Queen of Sheba, from the Farnese Hours
Pierpont Morgan Library, New York City Adoration of the Shepherds, and Fall of Man, from the Farnese Hours
State Museums of Florence Digital Archive, Italy
Professional Tools:
Artprice
Pictures from Image Archives:
Giorgio Giulio Clovio in the Web Gallery of Art 
Wikimedia Commons Image Database 
University of Michigan SILS Art Image Browser
Articles:
Encyclopedia Britannica complete article on Giorgio Giulio Clovio Note: The full version of the article is available only if you follow this link. If you bookmark the article and return later, or if you navigate directly to the Britannica website, you will see a 75-word preview only. Troubleshooting
Union List of Artist Names (Getty Museum) Reference sheet with basic information about the artist and pointers to other references.
Wikipedia, the "Open Content" Encyclopedia Biographical info
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