The National Heritage Institute. Dating Sec. XX, 1/4. Attribution to Creative Commons (CC BY-SA 4.0) https://creativecommons.org/licenses/by-sa/4.0/ Digitally enhanced.
Christian art; an illustrated monthly magazine devoted to current church building, American and foreign, and the allied ecclesiological arts, with expert discussions of all topics relating to Christian archaeology, 1907, public domain.
The National Heritage Institute, first quarter of the 16th century. Attributions to Creative Commons (CC BY-SA 4.0) https://creativecommons.org/licenses/by-sa/4.0/ Digitally enhanced.
Bavarian State Painting Collections - Alte Pinakothek Munich, Inventory number 1766, licensed under (CC BY-SA 4.0) https://creativecommons.org/licenses/by-sa/4.0/ Digitally Enhanced.
BALaT, Licensed under CC BY 4.0 KIK-IRPA, Brussels (Belgium), cliché X038272] https://creativecommons.org/licenses/by/4.0/, https://balat.kikirpa.be/copyright/copyright_en-GB.php Digitally Enhanced.