Johannes Itten art links 

Dallas Museum of Art, Texas

Museum of Modern Art, New York City
2 works online when last checked

Bauhaus-Archiv Museum of Design, Berlin
Description of Itten's preliminary course taught at the Bauhaus school 1919-1922

Harvard University Art Museums, Massachusetts

Johannes Itten in the Los Angeles County Museum of Art Database

Museum of Modern Art, New York City - Provenance Research Project
Space Composition, I [Raum Komposition I], 1944
Space Composition, II [Raum Komposition II], 1944

Johannes Itten at the Smithsonian American Art Museum, Washington D.C.

Thyssen-Bornemisza Museum, Madrid
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National Art Databases and Museum Inventories:

Swiss Institute for Art Research (SIKART)  
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Artarchiv Sample Artist Signatures
Scroll down to signature 186

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)

 

Bildindex der Kunst und Architektur (in German)  
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Ciudad de la Pintura (in Spanish)  

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	Flickr: "Johannes Itten"
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Answers.com reference works  
The "Art Encyclopedia" entry is from the Concise Grove Dictionary of Art (2002). The "Photography Encyclopedia" entry is from the The Oxford Companion to the Photograph (2005).

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

Wikipedia, the "Open Content" Encyclopedia

Oxford Dictionary of Art (eNotes)