Catholic Church. Pope (1878-1903 : Leo XIII), Leo XIII, P., & Treacy, G. C. (1942). Christian marriage: Encyclical letter of Pope Leo XIII. Paulist Press.
Chicago Style (17th ed.) CitationCatholic Church. Pope (1878-1903 : Leo XIII), Pope Leo XIII, and Gerald C. Treacy. Christian Marriage: Encyclical Letter of Pope Leo XIII. New York: Paulist Press, 1942.
MLA (8th ed.) CitationCatholic Church. Pope (1878-1903 : Leo XIII), et al. Christian Marriage: Encyclical Letter of Pope Leo XIII. Paulist Press, 1942.
Warning: These citations may not always be 100% accurate.