The Reconstruction of the Social Order: Encyclical of His Holiness Pope Pius XI (Quadragesimo Anno), Arranged for Study Clubs with Questions and References; The America Press, New York, 1938, PGEN 132/5851. General Collection, GEN. University of Notre Dame Archives. https://archivesspace.library.nd.edu/repositories/2/archival_objects/1097518 Accessed November 25, 2024.