Catholic Church. Pope (1878-1903 : Leo XIII) & Treacy, G. C. (1941). Christian democracy: Encyclical letter of Pope Leo XIII. Graves de communi. The Paulist Press.
Chicago-referens (17:e uppl.)Catholic Church. Pope (1878-1903 : Leo XIII) och Gerald C. Treacy. Christian Democracy: Encyclical Letter of Pope Leo XIII. Graves De Communi. New York: The Paulist Press, 1941.
MLA-referens (8:e uppl.)Catholic Church. Pope (1878-1903 : Leo XIII) och Gerald C. Treacy. Christian Democracy: Encyclical Letter of Pope Leo XIII. Graves De Communi. The Paulist Press, 1941.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.