1. Abel, P. D. 1989. Water pollution biology. Ellis Horwood Ltd., Chichester, England.
2. Brandt G. H., E. S. Conyers, F. J. Lowes, J. W. Mighton, and Pollack, J. W. 1972. An economic analysis of erosion and sediment control for watersheds undergoing urbanization. Dow Chemical Company, Midland, Michigan.
3. Brookshire, D. S., M. A. Thayer, W. D. Schulze, and R. C. d’Arge. 1982. Valuing public goods: a comparison of survey and hedonic approaches.American Economic Review 72:165–177.
4. Clark, E. H., J. A. Haverkamp, and D. Chapman. 1985. Eroding soils: The off-farm impacts. The Conservation Foundation, Washington, DC.
5. Colacicco, D., T. Osborn, and K. Alt. 1989 Economic damage from soil erosion.Journal of Soil and Water Conservation 44(1):35–39.