1. AMPRC (1989).Agricultural statistical data of China in 1988. Beijing, China: Agricultural Ministry of PRC, Agricultural Press.
2. Bartlett, A.A. (1989). Fusion and the future.Physics and Society, 18 (3), 11.
3. Beaumont, P. (1985). Irrigated agriculture and groundwater mining on the High Plains of Texas, USA.Environ. Cons., 12, 11 pp.
4. Birdsall, N. (1980).Population and poverty in the developing world. World Bank Staff Working Papers No. 404. Washington, DC: The World Bank.
5. BP (1991).British Petroleum statistical review of world energy. London: British Petroleum Corporate Communications Services.