APA (7th ed.) Citation

Catholic Church. Pope (1922-1939 : Pius XI) & McGowan, R. A. (1928). The promotion of true religious unity: Encyclical letter of His Holiness Pope Pius XI issued January 6, 1928. National Catholic Welfare Conference.

Chicago Style (17th ed.) Citation

Catholic Church. Pope (1922-1939 : Pius XI) and R. A. McGowan. The Promotion of True Religious Unity: Encyclical Letter of His Holiness Pope Pius XI Issued January 6, 1928. Washington, D.C.: National Catholic Welfare Conference, 1928.

MLA (8th ed.) Citation

Catholic Church. Pope (1922-1939 : Pius XI) and R. A. McGowan. The Promotion of True Religious Unity: Encyclical Letter of His Holiness Pope Pius XI Issued January 6, 1928. National Catholic Welfare Conference, 1928.