Zimny, Mateusz. “The Preaching of Indulgences from the Roman Hospital Sancti Spiritus in Saxia in Poland, Lithuania, Silesia and Prussia in the Fifteenth and Early Sixteenth Centuries”. Acta Mediaevalia. Series Nova 1 (December 13, 2024): 171–206. Accessed April 10, 2025. https://czasopisma.kul.pl/index.php/amsn/article/view/17608.