APA (7th ed.) Citation

Catholic Church. Pope (1922-1939 : Pius XI) & Pius XI, P. (1931). On social reconstruction: Encyclical letter. Daughters of St. Paul.

Chicago Style (17th ed.) Citation

Catholic Church. Pope (1922-1939 : Pius XI) and Pope Pius XI. On Social Reconstruction: Encyclical Letter. Boston, Mass.: Daughters of St. Paul, 1931.

MLA (8th ed.) Citation

Catholic Church. Pope (1922-1939 : Pius XI) and Pope Pius XI. On Social Reconstruction: Encyclical Letter. Daughters of St. Paul, 1931.

Warning: These citations may not always be 100% accurate.