Leo XIII, P. C. C. P. (1941). Immortale Dei, The Christian Constitution of States, Encyclical Letter of Pope Leo XIII. New York.
Chicago Style (17th ed.) CitationLeo XIII, Pope; Catholic Church. Pope. Immortale Dei, The Christian Constitution of States, Encyclical Letter of Pope Leo XIII. New York, 1941.
MLA (8th ed.) CitationLeo XIII, Pope; Catholic Church. Pope. Immortale Dei, The Christian Constitution of States, Encyclical Letter of Pope Leo XIII. New York, 1941.
Warning: These citations may not always be 100% accurate.