^Kirk, Andrew G (2007). Counterculture Green: The Whole Earth Catalog and American Environmentalism. Lawrence: Univ. of Kansas Press. pp. 120–122.
ISBN0700615458.
^Turner, Fred (2006). From Counterculture to Cyberculture: Stewart Brand, the Whole Earth Network, and the Rise of Digital Utopianism. Chicago: Univ. of Chicago Press. p. 294.
ISBN0-226-81741-5.
^Turner, Fred. From Counterculture to Cyberculture. p. 142.