Nicolaus Knupfer art links 

Hermitage Museum, Saint Petersburg, Russia
The Queen of Sheba before Solomon, ca.1640s
Hercules Obtaining the Girdle of Hyppolita

J. Paul Getty Museum, Los Angeles
Christ Before Pilate, 1640
Solon before Croesus, 1650

Kunsthistorisches Museum Databank, Vienna (in German)  

Louvre Museum Graphic Art Database, Paris (in French)  

Nicolaus Knupfer at the Metropolitan Museum of Art, New York City  

Nicolaus Knupfer at the Rijksmuseum, Amsterdam
Brothel Scene, Possibly an Episode from a Story, ca.1650

Nicolaus Knupfer at the Rijksmuseum, Amsterdam
Great scans of Rijksmuseum paintings, from the 'Memory of the Netherlands' project

Rijksmuseum Research Database, Amsterdam (in Dutch)  
2 works by Nicolaus Knüpfer online

Statens Museum for Kunst (National Gallery of Denmark), Copenhagen
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Artarchiv Sample Artist Signatures
Scroll down to signature 223

Sotheby's Sold Lot Archive   NEW!
(database goes as far back as 1998; images where permitted by copyright go about as far back as 2001)

 

Nicolaus Knupfer in the Art Renewal Center

Nicolaus Knupfer at CGFA  

Nicolaus Knupfer in the Web Gallery of Art  

Wikimedia Commons Image Database  

World Visit Guide (formerly Insecula)

Bildindex der Kunst und Architektur (in German)  
(a welcome screen is displayed for a couple of seconds before the search results appear)

Ciudad de la Pintura (in Spanish)  

State Hermitage Museum Unofficial Site

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Union List of Artist Names (Getty Museum)  
Reference sheet with basic information about the artist and pointers to other references.