Catholic Church. Pope (1922-1939 : Pius XI) & Pius XI, P. (1955). Reconstructing the social order: Encyclical letter Quadragesimo anno. Australian Catholic Truth Society.
Παραπομπή σε μορφή Chicago (17η εκδ.)Catholic Church. Pope (1922-1939 : Pius XI) και Pope Pius XI. Reconstructing the Social Order: Encyclical Letter Quadragesimo Anno. Melbourne: Australian Catholic Truth Society, 1955.
Παραπομπή σε μορφή MLA (8th εκδ.)Catholic Church. Pope (1922-1939 : Pius XI) και Pope Pius XI. Reconstructing the Social Order: Encyclical Letter Quadragesimo Anno. Australian Catholic Truth Society, 1955.
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