Leo XIII, P. (1936). On the condition of the working classes (Rerum novarum): Encyclical of His Holiness Pope Leo XIII : arranged for study clubs, with questions and references. New York.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Leo XIII, Pope. On the Condition of the Working Classes (Rerum Novarum): Encyclical of His Holiness Pope Leo XIII : Arranged for Study Clubs, with Questions and References. New York, 1936.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)Leo XIII, Pope. On the Condition of the Working Classes (Rerum Novarum): Encyclical of His Holiness Pope Leo XIII : Arranged for Study Clubs, with Questions and References. New York, 1936.
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