Catholic Church. Pope (1922-1939 : Pius XI) & Pius XI, P. Why a retreat?: "Mens nostra," the encyclical of Pope Pius XI on Laymen's retreats. Paulist Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Catholic Church. Pope (1922-1939 : Pius XI) و Pope Pius XI. Why a Retreat?: "Mens Nostra," the Encyclical of Pope Pius XI on Laymen's Retreats. New York: Paulist Press.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Catholic Church. Pope (1922-1939 : Pius XI) و Pope Pius XI. Why a Retreat?: "Mens Nostra," the Encyclical of Pope Pius XI on Laymen's Retreats. Paulist Press.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.