1. Nordhaus, W. D. Setting National Priorities: Policy for the Nineties (ed. Aaron, H.) 185–211 (Brookings, Washington,1990).
2. Adams, R. McC. & Nissen, H. The Uruk Countryside: The Natural Setting of Urban Societies (University of Chicago Press, Chicago, 1972).
3. Newman, L. F. (ed.) Hunger in History: Food Shortage, Poverty, and Deprivation (Blackwell, Oxford, 1990).
4. Desmond, K. Harwin Chronology of Inventions, Innovations, and Discoveries from Pre-History to the Present Day (Constable, London, 1986).
5. Schelling, T. C. in Changing Climate (National Research Council) 449–482 (National Academy Press, Washington,1983).