APA (7th ed.) Citation

Catholic Church. Pope (1922-1939 : Pius XI), Treacy, G. C., & Pius XI, P. (1939). Encyclical letter of Pope Pius XI on reconstructing the social order. Paulist Press.

Chicago Style (17th ed.) Citation

Catholic Church. Pope (1922-1939 : Pius XI), Gerald C. Treacy, and Pope Pius XI. Encyclical Letter of Pope Pius XI on Reconstructing the Social Order. New York: Paulist Press, 1939.

MLA (8th ed.) Citation

Catholic Church. Pope (1922-1939 : Pius XI), et al. Encyclical Letter of Pope Pius XI on Reconstructing the Social Order. Paulist Press, 1939.