Clipper, J. (1900). Unpublished letters. John Clipper to Rev. S. S. Cooper. Records of the American Catholic Historical Society of Philadelphia. Volume XI. Pages 70-71. Philadelphia : American Catholic Historical Society of Philadelphia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Clipper, John. Unpublished Letters. John Clipper to Rev. S. S. Cooper. Records of the American Catholic Historical Society of Philadelphia. Volume XI. Pages 70-71. Philadelphia : American Catholic Historical Society of Philadelphia, 1900.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Clipper, John. Unpublished Letters. John Clipper to Rev. S. S. Cooper. Records of the American Catholic Historical Society of Philadelphia. Volume XI. Pages 70-71. Philadelphia : American Catholic Historical Society of Philadelphia, 1900.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.