Roberts, C. (2020). Ullathorne's The Immaculate Conception of the Mother of God (1904): Doctrinal eclecticism, pastoral implications. International Marian Research Institute.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Roberts, Christopher. Ullathorne's The Immaculate Conception of the Mother of God (1904): Doctrinal Eclecticism, Pastoral Implications. Dayton, Ohio: International Marian Research Institute, 2020.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Roberts, Christopher. Ullathorne's The Immaculate Conception of the Mother of God (1904): Doctrinal Eclecticism, Pastoral Implications. International Marian Research Institute, 2020.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.