Frey, W. N. (1931). The act of religious profession: A brief historical synopsis and commentary. Catholic University of America.
Chicago-referens (17:e uppl.)Frey, Wolfgang Norbert. The Act of Religious Profession: A Brief Historical Synopsis and Commentary. Washington, D.C.: Catholic University of America, 1931.
MLA-referens (8:e uppl.)Frey, Wolfgang Norbert. The Act of Religious Profession: A Brief Historical Synopsis and Commentary. Catholic University of America, 1931.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.