Treacy, G. C. L. X. (1941). Christian democracy, encyclical letter of Pope Leo XIII. Graves de communi. With Discussion Club Outline by Rev. Gerald C. Treacy, S.J. New York.
Chicago-referens (17:e uppl.)Treacy, Gerald C.; Leo XIII. Christian Democracy, Encyclical Letter of Pope Leo XIII. Graves De Communi. With Discussion Club Outline by Rev. Gerald C. Treacy, S.J. New York, 1941.
MLA-referens (8:e uppl.)Treacy, Gerald C.; Leo XIII. Christian Democracy, Encyclical Letter of Pope Leo XIII. Graves De Communi. With Discussion Club Outline by Rev. Gerald C. Treacy, S.J. New York, 1941.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.