O'Hara, E. V. (1931). Catholic Evidence Work in the United States: A Survey of Its Status and of Its Prospects. S.I..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)O'Hara, Edwin V. Catholic Evidence Work in the United States: A Survey of Its Status and of Its Prospects. S.I., 1931.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)O'Hara, Edwin V. Catholic Evidence Work in the United States: A Survey of Its Status and of Its Prospects. S.I., 1931.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.