Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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