The Encyclical Letter of His Holiness, Pope Pius XI, on the Seventh Centenary of the Death of St. Francis of Assisi, PCHE 67/05, Box: PCHE 67. Daniel Cherico Collection, CHE. University of Notre Dame Archives. https://archivesspace.library.nd.edu/repositories/2/archival_objects/1785879 Accessed November 23, 2024.