Leo XIII, P. C. C. P. (1880). Encyclical Letter of Pope Leo XIII on Christian Marriage. Philadelphia.
Chicago Style (17th ed.) CitationLeo XIII, Pope; Catholic Church. Pope. Encyclical Letter of Pope Leo XIII on Christian Marriage. Philadelphia, 1880.
MLA (8th ed.) CitationLeo XIII, Pope; Catholic Church. Pope. Encyclical Letter of Pope Leo XIII on Christian Marriage. Philadelphia, 1880.
Warning: These citations may not always be 100% accurate.