Paintings in Museums and Public Art Galleries:
Hermitage Museum, Saint Petersburg, Russia The Lute Player
Nicolas Tournier in the Louvre Museum Database, Paris (only available in French) 2 paintings
High Museum of Art, Atlanta, Georgia The Denial of St. Peter, ca.1630
Hood Museum of Art, New Hampshire The Arrest of Christ
Joconde Database of French Museum Collections (in French) 
Musée des Augustins, Toulouse, France Vierge a L'Enfant, 1632-35
Musée des Augustins, Toulouse, France Descent from the Cross, 1632-35
Musée des Augustins, Toulouse, France Christ Carried to the Tomb, 1632-35
Musée des Augustins, Toulouse, France Un Soldat, ca.1630
Musée des Augustins, Toulouse, France Le Reniement de Saint Pierre
Portland Art Museum, Oregon Banquet Scene with Lute Player, 1626-27
Ringling Museum of Art, Florida Tobias Taking Leave of His Parents
Saint Louis Art Museum, Missouri A Musical Party, ca.1625
State Museums of Florence Digital Archive, Italy
Professional Tools:
Artprice
Pictures from Image Archives:
Nicolas Tournier in the Art Renewal Center
Nicolas Tournier at Insecula
Nicolas Tournier in the Web Gallery of Art 
Wikimedia Commons Image Database 
Bildindex der Kunst und Architektur (in German) 
California State University WorldImages Database  Allegory of Justice and Vanity
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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