^Mingardi, Alberto (2011). Herbert Spencer. Continuum. p. 123. ISBN9780826424860.
^Bristow, Edward (1970). The defence of liberty and property in Britain, 1880-1914 (Thesis). Yale University. Quotes Donisthorpe in the Westminster Gazette: "The Late Lord Bramwell, Tolstoi, Herbert Spencer, Benjamin Tucker, Vaillart, Auberon Herbert, J.H Levy, Kropotkin, the late Charles Bradlaugh, Yves Guyot, Caserio, and thousands of smaller fry, including myself, are anarchists".