1. Andreae, B. (1974). Problems of improving the productivity in tropical farming. InApplied Science and Development, Vol. 3. Institute for Scientific Co-operation, Tübingen, pp. 124?142.
2. Boserup, E. (1965).The Conditions of Agricultural Growth: The Economics of Agrarian Change Under Population Pressure. Aldine, Chicago.
3. Brookfleld, H. C., and Brown, P. (1963).Struggle for Land: Agriculture and Group Territories Among the Chimbu of the New Guinea Highlands. Oxford University Press, Melbourne.
4. Brookfleld, H. C., with Hart, D. (1971).Melanesia: A Geographical Interpretation of an Island World. Methuen, London.
5. Burkill, I. H. (1935).A Dictionary of the Economic Products of the Malay Peninsula. Crown Agents for the Colonies, London.