Encyclical Letter of His Holiness, Pope Pius XI (Divini Redemptoris): Atheistic Communism; Knights of Columbus, New Haven, Connecticut, 1937/0319, PGEN 126/5356. General Collection, GEN. University of Notre Dame Archives. https://archivesspace.library.nd.edu/repositories/2/archival_objects/1097022 Accessed November 29, 2024.