Catholic Church. Pope (1922-1939 : Pius XI) & Pius XI, P. (1937). On the recitation of the rosary to combat modern world evils: Encyclical letter (Ingravescentibus malis) of His Holiness Pope Pius XI. National Catholic Welfare Conference.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Catholic Church. Pope (1922-1939 : Pius XI) و Pope Pius XI. On the Recitation of the Rosary to Combat Modern World Evils: Encyclical Letter (Ingravescentibus Malis) of His Holiness Pope Pius XI. Washington, D. C.: National Catholic Welfare Conference, 1937.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Catholic Church. Pope (1922-1939 : Pius XI) و Pope Pius XI. On the Recitation of the Rosary to Combat Modern World Evils: Encyclical Letter (Ingravescentibus Malis) of His Holiness Pope Pius XI. National Catholic Welfare Conference, 1937.