"The 100 best nonfiction books: No 68 - Narrative of the Life of Frederick Douglass, an American Slave by Frederick Douglass (1845)" by Robert McCrum, www.theguardian.com. May 22, 2017.
"Schooling: The Hidden Agenda". Daniel Quinn's Address at the Annual Conference of the North American Association for Environmental Education in Vancouver, Canada, www.ishmael.org. August 16, 1997.