textsUniversal Exhibition, 1900: The Masterpieces, vol.4, Public Domain.
National Cultural Heritage Agency, Interbellum_0656, Digitally Enhanced, http://creativecommons.org/licenses/by-sa/3.0/
Georg-August University of Göttingen, art history. Free modification of a composition by Anton van Dyck,
Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) https://creativecommons.org/licenses/by-sa/4.0/ Digitally Enhanced.
Salon of ...1898, Commemorates exhibitions of the Society of French Artists.
BALaT Licensed under CC BY 4.0 KIK-IRPA, Brussels (Belgium), cliché X064677] https://creativecommons.org/licenses/by/4.0/ Digitally Enhanced.
BALaT License under CC BY 4.0 KIK-IRPA, Brussels (Belgium), cliché X118329] https://creativecommons.org/licenses/by/4.0/ Digitally Enhanced.
Christian Art; Monthly magazine for all areas of Christian art and art studies v.2 (1906). Public Domain
Art for everyone: painting, sculpture, graphics, architecture — 18.1902-1903. Public Domain.
Sammlung. Attribution to Creative commons licences https://creativecommons.org/licenses/by-sa/4.0/ Digitally enhanced
BALaT. License under CC BY 4.0 KIK-IRPA, Brussels (Belgium), cliché X078737] https://creativecommons.org/licenses/by/4.0/ Digitally Enhanced.
Christian Art; Monthly magazine for all areas of Christian art and art studies, 1912/1913, vol.9 public Domain
Bavarian State Painting Collections - Neue Pinakothek Munich. Creative Commons License https://creativecommons.org/licenses/by-sa/4.0/ Digitally Enhanced.
Sammlung. Attributions to Creative Commons License https://creativecommons.org/licenses/by-sa/4.0/ Digitally Enhanced
National Cultural Heritage Agency of Netherlands / 559,588 Digitally Enhanced, http://creativecommons.org/licenses/by-sa/3.0/
Library of Congress
Public Domain
Berlin State Museums, Purchased by public subscription, Digitally Enhanced, Creative Commons License https://creativecommons.org/licenses/by-sa/4.0/
Public Domain
Smithsonian American Art Museum
Public Domain