APA (7th ed.) Citation

Catholic Church. Pope (1922-1939 : Pius XI), Pius, X., & Treacy, G. C. (1930). Christian education of youth: Encyclical letter. Paulist Press.

Chicago Style (17th ed.) Citation

Catholic Church. Pope (1922-1939 : Pius XI), XI Pius, and Gerald C. Treacy. Christian Education of Youth: Encyclical Letter. New York, N.Y.: Paulist Press, 1930.

MLA (8th ed.) Citation

Catholic Church. Pope (1922-1939 : Pius XI), et al. Christian Education of Youth: Encyclical Letter. Paulist Press, 1930.