1. Hall DO, Rosillo-Calle F, Williams RH, Woods JT, Johannson B, Kelly H, Reddy AKN, Williams RH, editors. Renewable energy. Washington: Island Press, 1993. p. 593–651
2. WEC World Energy Council. London: Kogan Page, 1994
3. Ravindranath NH, Hall DO. Biomass, energy and environment; a developing country perspective from India. Oxford University Press, 1995
4. IPCC Scientific-technical analysis. Cambridge University Press, 1996
5. Ranney JW. Energy crops forum; biofuels feedstock development program. Oak Ridge, TN, 1992