National Cultural Heritage Agency of Netherlands, Digitally Enhanced, http://creativecommons.org/licenses/by-sa/3.0/
Mölndals Stadsmuseum, Digitally Enhanced
Attribution to Creative Commons, https://creativecommons.org/licenses/by-sa/4.0/
Sörmland Museum, Digitally Enhanced
Attribution to Creative Commons, https://creativecommons.org/licenses/by-sa/4.0/
Master of Color, Digital College of the Bauhaus University of Weimar
Public Domain
Bavarian State Painting Collection, Digitally Enhanced
Attribution to Creative Commons, https://creativecommons.org/licenses/by-sa/4.0/
The National Heritage Institute, dating 1915, Creative Commons (CC BY-SA 4.0) https://creativecommons.org/licenses/by-sa/4.0/, Digitally Enhanced.
Berlin State Museums, Art Library, Mark 1.0, https://creativecommons.org/publicdomain/mark/1.0/, Public Domain.
The National Heritage Institute, dating 1915, Creative Commons (CC BY-SA 4.0) https://creativecommons.org/licenses/by-sa/4.0/, Digitally Enhanced.
Berlin State Museums, National Gallery, Mark 1.0, https://creativecommons.org/publicdomain/mark/1.0/, Public Domain.
The National Heritage Institute, dating 1947, Creative Commons (CC BY-SA 4.0) https://creativecommons.org/licenses/by-sa/4.0/, Digitally Enhanced.
The National Heritage Institute, Creative Commons (CC BY-SA 4.0) https://creativecommons.org/licenses/by-sa/4.0/, Digitally Enhanced.
Berlin State Museums, Art Library, Mark 1.0, https://creativecommons.org/publicdomain/mark/1.0/, Public Domain.
The National Heritage Institute, dating 1910, Creative Commons (CC BY-SA 4.0) https://creativecommons.org/licenses/by-sa/4.0/, Digitally Enhanced.
Berlin State Museums, Art Library, Mark 1.0 https://creativecommons.org/publicdomain/mark/1.0/, Public Domain.
Courtesy of the Indianapolis Museum of Art at Newfields, dating 1909, Public Domain.
Berlin State Museums, Art Library, Mark 1.0, https://creativecommons.org/publicdomain/mark/1.0/, public Domain.
State Museums of Berlin, Art Library / Dietmar Katz. Mark 1.0, https://creativecommons.org/publicdomain/mark/1.0/ Public Domain.
National Cultural Heritage Agency, Document Number 319, Photo by G.J. Dukker, Digitally Enhanced, http://creativecommons.org/licenses/by-sa/3.0/