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/
BALaT Licensed under CC BY 4.0 KIK-IRPA, Brussels (Belgium), cliché KN006178] https://creativecommons.org/licenses/by/4.0/ https://balat.kikirpa.be/copyright/copyright_en-GB.php Digitally Enhanced
BALaT Licensed under CC BY 4.0 KIK-IRPA, Brussels (Belgium), cliché X010894] https://creativecommons.org/licenses/by/4.0/ https://balat.kikirpa.be/copyright/copyright_en-GB.php Digitally Enhanced
National Cultural Heritage Agency of Netherlands / Document No. 356, Photographer A. J. van der Wal, Digitally Enhanced, http://creativecommons.org/licenses/by-sa/3.0/
National Museum of Denmark, Digitally Enhanced
Attribution to Creative Commons, https://creativecommons.org/licenses/by-sa/4.0/
The Holy Sacrifice of the Mass: The Perpetual Sacrifice of the Catholic Church by Josef Merk
BALaT Licensed under CC BY 4.0 KIK-IRPA, Brussels (Belgium), cliché X046988] https://creativecommons.org/licenses/by/4.0/ https://balat.kikirpa.be/copyright/copyright_en-GB.php Digitally Enhanced
National Cultural Heritage Agency of Netherlands / Interbellum_0285, Digitally Enhanced, http://creativecommons.org/licenses/by-sa/3.0/
National Cultural Heritage Agency of Netherlands / Interbellum_0270, Photographer Sjaan van der Jagt, Digitally Enhanced, http://creativecommons.org/licenses/by-sa/3.0/
The Means of Grace: A Complete Exposition of the Seven Sacraments, 1821-1896
Public Domain