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 Unpublished letters.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スタイル(17版)引用形式Butler, T. R., , 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 Unpublished Letters.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(8版)引用形式Butler, T. R., , 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 Unpublished Letters.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.
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