1. Hornaday, W.T. (1889) Extermination of the American Bison. In the Annual Report of the Board of Regents of the Smithsonian Institution for the Year Ending June 30 1887 (Brown Goode, G., ed.), pp. 369–548, US Government Printing Office (Washington, DC, USA), (op. cit. p. 396)
2. Hornaday, W.T. (1887) The Passing of the Buffalo–I. The Cosmopolitan IV (October), p. 91
3. Ibid., p. 92
4. Hornaday, W.T., Eighty Fascinating Years (unpublished autobiography), chapter 10, p. 20. In The Papers of William T. Hornaday, held at the Library of Congress
5. The Washington Post 30 August (1886), p. 2