Butler, T. R., & Cooper, F. (1900). Unpublished letters. Records of the American Catholic Historical Society of Philadelphia. Volume XI. Pages 215-220. Philadelphia : American Catholic Historical Society of Philadelphia.
Chicago Style (17th ed.) CitationButler, T. R., and Francis Cooper. Unpublished Letters. Records of the American Catholic Historical Society of Philadelphia. Volume XI. Pages 215-220. Philadelphia : American Catholic Historical Society of Philadelphia, 1900.
MLA (8th ed.) CitationButler, T. R., and Francis Cooper. Unpublished Letters. Records of the American Catholic Historical Society of Philadelphia. Volume XI. Pages 215-220. Philadelphia : American Catholic Historical Society of Philadelphia, 1900.
Warning: These citations may not always be 100% accurate.