Paintings in Museums and Public Art Galleries:
Museum of Fine Arts, Boston 
Werner van den Valckert at the Rijksmuseum, Amsterdam Portrait of a Man with Ring and Touchstone, 1617
Rijksmuseum Research Database, Amsterdam (in Dutch)  3 paintings by Werner van den Valckert online
Pictures from Image Archives:
Artcyclopedia Masterscan feature: Portrait of a Man Holding a Ring, 1617
Werner van den Valckert in the Web Gallery of Art 
Bildindex der Kunst und Architektur (in German) 
Ciudad de la Pintura (in Spanish)  Five Regents of the Groot-Kramergild
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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