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^Hyde, William; Conard, Howard Louis (1899).Encyclopedia of the History of St. Louis: A Compendium of History and Biography for Ready Reference. Vol. 3. Southern History Company. p. 1523.OCLC1933545.
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^The Journal of Speculative Philosophy. Vol. 1–15. Pennsylvania State University Press. 1881. p. 105.
^Catalogue of Title Entries of Books and Other Articles Entered in the Office of the Register of Copyrights, Library of Congress, at Washington, D.C. Vol. 35. Washington D. C.: Library of Congress. 1903. p. 502.
^King, Moses (1882).The Poets' Tributes to Garfield: A Collection of Many Memorial Poems, with Portrait and Biography. Cambridge: M. King. p. 99.OCLC1175974949.