Catholic Church. Pope (1878-1903 : Leo XIII), Treacy, G. C., & Leo XIII, P. (1943). Labor's charter of liberty. Paulist Press.
Chicago Style (17. basım) AtıfCatholic Church. Pope (1878-1903 : Leo XIII), Gerald C. Treacy, ve Pope Leo XIII. Labor's Charter of Liberty. New York: Paulist Press, 1943.
MLA (8th ed.) AtıfCatholic Church. Pope (1878-1903 : Leo XIII), et al. Labor's Charter of Liberty. Paulist Press, 1943.
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