"Extremism in America: A Reader", NYU Press (1995), p. 11* Sanders, John T.; Narveson, Jan, "For and Against the State", Rowman and Littlefield Publishers, 1996, ISBN 978-0-8476-8165-5* Goodwin, Barbara.
"Extremism in America: A Reader", NYU Press (1995), p. 11* Sanders, John T.; Narveson, Jan, "For and Against the State", Rowman and Littlefield Publishers, 1996, ISBN 0-8476-8165-3* Goodwin, Barbara.