Catholic Church. Pope. (1891). Encyclical letter of our Holy Father by divine providence Pope Leo XIII on the condition of labor. Baltimore, MD: John Murphy & Co..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCatholic Church. Pope. Encyclical Letter of Our Holy Father by Divine Providence Pope Leo XIII on the Condition of Labor. Baltimore, MD: John Murphy & Co., 1891.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCatholic Church. Pope. Encyclical Letter of Our Holy Father by Divine Providence Pope Leo XIII on the Condition of Labor. Baltimore, MD: John Murphy & Co., 1891.
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