Watt, L. (1950). Pope Pius XI and social reconstruction. An introduction to the Encyclical Quadragesimo Anno. Oxford.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWatt, Lewis. Pope Pius XI and Social Reconstruction. An Introduction to the Encyclical Quadragesimo Anno. Oxford, 1950.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWatt, Lewis. Pope Pius XI and Social Reconstruction. An Introduction to the Encyclical Quadragesimo Anno. Oxford, 1950.
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