Catholic Church. Pope (1922-1939 : Pius XI), National Catholic Welfare Conference, & Pius XI, P. (1930). Encyclical letter of His Holiness, Pius XI, by divine providence, Pope ... on Christian education of youth.
Chicago Style (17th ed.) CitationCatholic Church. Pope (1922-1939 : Pius XI), National Catholic Welfare Conference, and Pope Pius XI. Encyclical Letter of His Holiness, Pius XI, by Divine Providence, Pope ... on Christian Education of Youth. Washington, D.C. : National Catholic Welfare Conference, 1930.
MLA (8th ed.) CitationCatholic Church. Pope (1922-1939 : Pius XI), et al. Encyclical Letter of His Holiness, Pius XI, by Divine Providence, Pope ... on Christian Education of Youth. 1930.
Warning: These citations may not always be 100% accurate.