Paintings in Museums and Public Art Galleries:
 Hermitage Museum, Saint Petersburg, Russia
The Marriage at Cana
Kunsthistorisches Museum Databank, Vienna (in German) 
Louvre Museum Database, Paris
Museum of Fine Arts, Boston 
Cleveland Museum of Art, Ohio
Courtauld Institute of Art, London, UK
Antiochus and Stratonice
Johann Heinrich Schonfeld in the Los Angeles County Museum of Art Database
National Brukenthal Museum, Romania
Prague Castle Picture Gallery, Czech Republic
The Joshua's Battle
Staatsgalerie Stuttgart (in German)
Treasure Diggers in Roman Ruins
Staatsgalerie Stuttgart (in German)
Solomon's Anointment and Coronation as King by the Priest Zadok
The Albertina Graphic Art Databank, Vienna (in German) NEW!
Pictures from Image Archives:
Johann Heinrich Schonfeld in the Art Renewal Center
Johann Heinrich Schonfeld in the Web Gallery of Art
Wikimedia Commons Image Database 
Bildindex der Kunst und Architektur (in German)
(a welcome screen is displayed for a couple of seconds before the search results appear)
State Hermitage Museum Unofficial Site NEW!
University of Leipzig, Germany
Miscellaneous Sites:
Artarchiv Sample Artist Signatures
Scroll down to signature 445
Artarchiv Sample Artist Symbols + Monograms
Scroll down to monogram 932
Articles and Reference Sites:
Grove Dictionary of Art Online (excerpt) 
Union List of Artist Names (Getty Museum)
Reference sheet with basic information about the artist and pointers to other references.
Oxford Dictionary of Art (eNotes) NEW!
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