APA (7th ed.) Citation

Pius XI, P. (1931). Quadragesimo Anno: Encyclical Letter of Pope Pius XI on Reconstructing the Social Order. New York.

Chicago Style (17th ed.) Citation

Pius XI, Pope. Quadragesimo Anno: Encyclical Letter of Pope Pius XI on Reconstructing the Social Order. New York, 1931.

MLA (8th ed.) Citation

Pius XI, Pope. Quadragesimo Anno: Encyclical Letter of Pope Pius XI on Reconstructing the Social Order. New York, 1931.

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