License, verbatimPD
The National Gallery of Art: open access image with no usage restrictions under the NGA's open access policy (openaccess=1 in the Gallery's published_images dataset).
Ernst Ludwig Kirchner and Alfred Döblin (author). Alfred Döblin: Das Stiftsfräulein und der Tod (Alfred Döblin: The Canoness and Death), 1913. National Gallery of Art, Washington.