Leo XIII, P. (1878). The great pastoral letters of Cardinal Pecci (now Pope Leo XIII) on the church and civilization. New York.
Chicago Style (17th ed.) CitationLeo XIII, Pope. The Great Pastoral Letters of Cardinal Pecci (now Pope Leo XIII) on the Church and Civilization. New York, 1878.
MLA (8th ed.) CitationLeo XIII, Pope. The Great Pastoral Letters of Cardinal Pecci (now Pope Leo XIII) on the Church and Civilization. New York, 1878.
Warning: These citations may not always be 100% accurate.