Roosevelt, T., 1898. Letter to Frederick Courteney Selous, 15 February 1898. Theodore Roosevelt Papers. Library of Congress Manuscript Division: https://www.theodorerooseveltcenter.org/Research/Digital-Library/Record?libID=o161
Roosevelt, T.; Grinnell, G.B., 1895. Hunting in many lands: the book of the Boone and Crockett club. New York ; Edinburgh, Forest and Stream publishing company, pp. 1-447