Catholic Church. Pope (1922-1939 : Pius XI), National Catholic Welfare Conference, & Pius XI, P. (1931). Encyclical letter of His Holiness, Pius XI, by Divine Providence Pope to our venerable brethren, the patriarchs, primates, archbishops, bishops and other ordinaries, in peace and communion with the Apostolic See concerning Catholic Action. National Catholic Welfare Conference.
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 to Our Venerable Brethren, the Patriarchs, Primates, Archbishops, Bishops and Other Ordinaries, in Peace and Communion with the Apostolic See Concerning Catholic Action. Washington, D.C.: National Catholic Welfare Conference, 1931.
MLA (8th ed.) CitationCatholic Church. Pope (1922-1939 : Pius XI), et al. Encyclical Letter of His Holiness, Pius XI, by Divine Providence Pope to Our Venerable Brethren, the Patriarchs, Primates, Archbishops, Bishops and Other Ordinaries, in Peace and Communion with the Apostolic See Concerning Catholic Action. National Catholic Welfare Conference, 1931.