1. Unsettling of America;Berry,1977
2. See, for example, Colin M. Turnbull, The Forest People: A Study of the Pygmies of the Congo, New York: Simon and Schuster, 1962.
3. Ecological Principles for Economic Development;Dasmann,1973
4. Conservation and Rational Use of the Environment, UNESCO and FAO report to the U.N. Economic and Social Council, Mar. 12, 1968.
5. Managing the Commons;Baden,1977