Pius XI, P., & Treacy, G. C. (1944). Love undying: A simplified edition of the encyclical Casti Connubii, on Christian marriage, by Pope Pius XI. Paulist Press.
Chicago Style (17th ed.) CitationPius XI, Pope, and Gerald C. Treacy. Love Undying: A Simplified Edition of the Encyclical Casti Connubii, on Christian Marriage, by Pope Pius XI. New York, N.Y.: Paulist Press, 1944.
MLA (8th ed.) CitationPius XI, Pope, and Gerald C. Treacy. Love Undying: A Simplified Edition of the Encyclical Casti Connubii, on Christian Marriage, by Pope Pius XI. Paulist Press, 1944.
Warning: These citations may not always be 100% accurate.