Jones, Alwyn K. 1990. Social Symbiosis: A Gaian Critique of Contemporary Social Theory. The Ecologist 20 (3): 108-113, p. 108.
Cohen, Anthony P. 1985. The Symbolic Construction of Community. Edited by Peter Hamilton. Key Ideas. London: Routledge.;Kumar, Krishan. 1978. Phrophecy and Progress: the Sociology of Industrail and Post-Industrial Society. Middlesex, England: Penguin Books.
Linden, Eugene. 1989. How the Earth Maintains Life. Time, Nov. 13, 1989, 114.