Catholic Church. Pope (1939-1958 : Pius XII) & Pius XII, P. On function of state in the modern world: Encyclical letter of His Holiness Pope Pius XII. St. Paul Editions.
Chicago Style (17th ed.) CitationCatholic Church. Pope (1939-1958 : Pius XII) and Pope Pius XII. On Function of State in the Modern World: Encyclical Letter of His Holiness Pope Pius XII. Boston: St. Paul Editions.
MLA (8th ed.) CitationCatholic Church. Pope (1939-1958 : Pius XII) and Pope Pius XII. On Function of State in the Modern World: Encyclical Letter of His Holiness Pope Pius XII. St. Paul Editions.
Warning: These citations may not always be 100% accurate.