Pius XI, P. (1931). Quadragesimo Anno: Encyclical Letter of Pope Pius XI on Reconstructing the Social Order. New York.
Citace podle Chicago (17th ed.)Pius XI, Pope. Quadragesimo Anno: Encyclical Letter of Pope Pius XI on Reconstructing the Social Order. New York, 1931.
Citace podle MLA (8th ed.)Pius XI, Pope. Quadragesimo Anno: Encyclical Letter of Pope Pius XI on Reconstructing the Social Order. New York, 1931.
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