Rozen, Fryderyk. “The 15-Th Century Edition of the Pauline Missal As a Source for Gregorian Chant History”. Saeculum Christianum. Historical Writings 30, no. 2 (December 31, 2023): 89–101. Accessed November 5, 2026. https://czasopisma.uksw.edu.pl/sc/article/view/13495.