APA (7th ed.) Citation

Catholic Church. Pope (1922-1939 : Pius XI), Pius XI, P., & Treacy, G. C. (1929). Christian education of youth. Paulist Press.

Chicago Style (17th ed.) Citation

Catholic Church. Pope (1922-1939 : Pius XI), Pope Pius XI, and Gerald C. Treacy. Christian Education of Youth. New York: Paulist Press, 1929.

MLA (8th ed.) Citation

Catholic Church. Pope (1922-1939 : Pius XI), et al. Christian Education of Youth. Paulist Press, 1929.