Encyclical Letter of His Holiness Pope Pius XII (Summi Pontificatus): Exhorting Unity in Opposing World Evils; Knights of Columbus, New Haven, Connecticut, 1939/1026, PGEN 128/5547. General Collection, GEN. University of Notre Dame Archives. https://archivesspace.library.nd.edu/repositories/2/archival_objects/1097213 Accessed November 29, 2024.