1. Asian Development Bank (ADB), 1996. Economic Evaluation of Environmental Impacts: a Workbook, Environment Division, Asian Development Bank, Manila, Philippines, March.
2. Ceylon Electricity Board (CEB), 1994a. Conceptual Design Report, Upper Kotmale Hydropower Project, Joint Venture CNEC for Ceylon Electricity Board, March.
3. Ceylon Electricity Board (CEB), 1994b. Environmental Impact Assessment Report, Upper Kotmale Hydropower Project, Volume 1, Main Report, Joint Venture CNEC for Ceylon Electricity Board, September.
4. Economic Analysis of the Environmental Impacts of Development Projects;Dixon,1988
5. Hearne, R.R., 1996. “Economic valuation of use and non-use values of environmental goods and services in developing countries”, Project Appraisal, Beech Tree Publishing, U.K., Volume 11, No. 4, December, pp. 255–260.