1. The World Bank (1982). World Development Report 1982. Oxford University Press, New York.
2. Biomass for Energy in the Developing Countries;Hall,1982
3. Biochemical and Photosynthetic Aspects of Energy Production;Hall,1980
4. The world's forests;Sedjo;Resources,1982
5. Biogas Technology in the Third World: A Multidisciplinary Review;Barnett,1978