Catholic Church. Pope (1939-1958 : Pius XII) & Pius XII, P. (1944). Encyclical letter of Pope Pius XII on St. Cyril, Patriarch of Alexandria, on the fifteenth centenary of his most holy death. National Catholic Welfare Conference.
Chicago Style (17th ed.) CitationCatholic Church. Pope (1939-1958 : Pius XII) and Pope Pius XII. Encyclical Letter of Pope Pius XII on St. Cyril, Patriarch of Alexandria, on the Fifteenth Centenary of His Most Holy Death. Washington: National Catholic Welfare Conference, 1944.
MLA (8th ed.) CitationCatholic Church. Pope (1939-1958 : Pius XII) and Pope Pius XII. Encyclical Letter of Pope Pius XII on St. Cyril, Patriarch of Alexandria, on the Fifteenth Centenary of His Most Holy Death. National Catholic Welfare Conference, 1944.
Warning: These citations may not always be 100% accurate.