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.
Master Of Color. Contemporary European Art, Issue 7, 1910. Public Domain
Europeana.eu. Attribution to Creative Commons License https://creativecommons.org/licenses/by/4.0/ digitally Enhanced
National Museum, Attributions to 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
On the history of Düsseldorf art, especially in the 19th century, 1902. Public Domain.
Sacred art; the Bible story pictured by eminent modern painters; 1903. Public Domain.
The international studio, vol.39, no.156 (1910). Public Domain
Sacred art; the Bible story pictured by eminent modern painters; 1903. Public Domain
Digital Museum, Attribution (CC BY) https://creativecommons.org/licenses/by/4.0/ Digitally Enhanced