Catholic Church. Pope (1922-1939 : Pius XI), Pius, X., & Treacy, G. C. (1930). Christian education of youth: Encyclical letter. Paulist Press.
Chicagoスタイル(17版)引用形式Catholic Church. Pope (1922-1939 : Pius XI), XI Pius, , Gerald C. Treacy. Christian Education of Youth: Encyclical Letter. New York, N.Y.: Paulist Press, 1930.
MLA(8版)引用形式Catholic Church. Pope (1922-1939 : Pius XI), et al. Christian Education of Youth: Encyclical Letter. Paulist Press, 1930.
警告: この引用は必ずしも正確ではありません.