Leo XIII, P. C. C. P. (1891). Encyclical letter of Our Holy Father, by divine providence Pope Leo XIII on the condition of labor. Baltimore.
Citace podle Chicago (17th ed.)Leo XIII, Pope; Catholic Church. Pope. Encyclical Letter of Our Holy Father, by Divine Providence Pope Leo XIII on the Condition of Labor. Baltimore, 1891.
Citace podle MLA (8th ed.)Leo XIII, Pope; Catholic Church. Pope. Encyclical Letter of Our Holy Father, by Divine Providence Pope Leo XIII on the Condition of Labor. Baltimore, 1891.
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