APA (7th ed.) Citation

Catholic Church. Pope (1878-1903 : Leo XIII), Leo XIII, P., & Treacy, G. C. (1945). Christian state or pagan chaos! Paulist Press.

Chicago Style (17th ed.) Citation

Catholic Church. Pope (1878-1903 : Leo XIII), Pope Leo XIII, and Gerald C. Treacy. Christian State or Pagan Chaos! New York: Paulist Press, 1945.

MLA (8th ed.) Citation

Catholic Church. Pope (1878-1903 : Leo XIII), et al. Christian State or Pagan Chaos! Paulist Press, 1945.