APA (7th ed.) Citation

Catholic Church. Pope (1878-1903 : Leo XIII) & Treacy, G. C. (1941). Immortale Dei, the Christian constitution of states: Encyclical letter. Paulist Press.

Chicago Style (17th ed.) Citation

Catholic Church. Pope (1878-1903 : Leo XIII) and Gerald C. Treacy. Immortale Dei, the Christian Constitution of States: Encyclical Letter. New York: Paulist Press, 1941.

MLA (8th ed.) Citation

Catholic Church. Pope (1878-1903 : Leo XIII) and Gerald C. Treacy. Immortale Dei, the Christian Constitution of States: Encyclical Letter. Paulist Press, 1941.

Warning: These citations may not always be 100% accurate.