Catholic Church. Pope, Catholic Church. Pope (1878-1903 : Leo XIII), Catholic Church. Pope (1922-1939 : Pius XI), & Treacy, G. C. (1939). Five great encyclicals: Labor, education, marriage, reconstructing the social order, atheistic communism. Paulist Press.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Catholic Church. Pope, Catholic Church. Pope (1878-1903 : Leo XIII), Catholic Church. Pope (1922-1939 : Pius XI), và Gerald C. Treacy. Five Great Encyclicals: Labor, Education, Marriage, Reconstructing the Social Order, Atheistic Communism. New York: Paulist Press, 1939.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)Catholic Church. Pope, et al. Five Great Encyclicals: Labor, Education, Marriage, Reconstructing the Social Order, Atheistic Communism. Paulist Press, 1939.
Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.