Catholic Church. Pope (1878-1903 : Leo XIII) & Treacy, G. C. (1941). The chief duties of Christians as citizens. The Paulist Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Catholic Church. Pope (1878-1903 : Leo XIII) و Gerald C. Treacy. The Chief Duties of Christians as Citizens. New York: The Paulist Press, 1941.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Catholic Church. Pope (1878-1903 : Leo XIII) و Gerald C. Treacy. The Chief Duties of Christians as Citizens. The Paulist Press, 1941.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.