1. Arnon, I., 1981. Modernization of Agriculture in Developing Countries: Resources, Potentials and Problems. John Wiley & Sons, Chichester.
2. Barnard, G.W. & Hall, D.O., 1983. Energy from renewable sources ethanol fermentation and anaerobic digestion. In: H. Dellweg (ed.), Biotechnology, Vol III, pp. 595–625. Verlag Chemie, Weinheim.
3. Barr, T.N., 1981. The world food situation and global grain prospects. Science 214: 1087–1095.
4. Berg, A., 1981. Malnourished People: a Policy Review. Poverty and Basic Needs Series. World Bank, Washington DC 20433.
5. Bioenergy Council, 1981. International Bio Energy Directory. The Bioenergy Council, Washington DC 20006, U.S.A.