Catholic Church. Pope (1878-1903 : Leo XIII). (1900). Rerum novarum: Encyclical letter of Pope Leo XIII on the condition of labor. Paulist Press.
Dyfyniad Arddull ChicagoCatholic Church. Pope (1878-1903 : Leo XIII). Rerum Novarum: Encyclical Letter of Pope Leo XIII on the Condition of Labor. New York: Paulist Press, 1900.
Dyfyniad MLACatholic Church. Pope (1878-1903 : Leo XIII). Rerum Novarum: Encyclical Letter of Pope Leo XIII on the Condition of Labor. Paulist Press, 1900.
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