1. Battelle-Columbus Labs (1973).Development of the Arizona Environmental and Economic Trade-Off Model, Battelle-Columbus, Ohio.
2. Boulding, K. E. (1973). The need for reform of national income statistics. InProceedings of the American Statistical Association: Social Statistics Section, pp. 94?97.
3. Buchanan, J. M., and Tullock, G. (1965).The Calculus of Consent, University of Michigan Press, Ann Arbor.
4. Curtis, V. (ed.) (1973).Land Use and the Environment, Environmental Protection Agency, Washington, D.C.
5. Downs, A. (1957).An Economic Theory of Democracy, Harper and Row, New York.