Warren Allen Smith: Who's Who in Hell, A Handbook and International Directory for Humanists, Freethinkers, Naturalists, Rationalists, and Non-Theists, Barricade Books, New York, 2000, p. 186; 978-1-56980-158-1.
Derek Wall, Green History : A Reader in Environmental Literature, Philosophy and Politics, London, Routledge, 1993. 041507925X (pp. 232-34)