Paintings in Museums and Public Art Galleries:
Francesco Bonsignori at the National Gallery, London, UK
Rijksmuseum Research Database, Amsterdam (in Dutch) 
Museo Poldi Pezzoli, Milan, Italy Half-Bust Figure of a Saint
Philadelphia Museum of Art (On the zoom-in page, use the slider bar to magnify the image)
Professional Tools:
Artprice
Pictures from Image Archives:
Francesco Bonsignori in the Art Renewal Center
Francesco Bonsignori in the Web Gallery of Art 
Bildindex der Kunst und Architektur (in German) 
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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