1. Barker R, Herdt RW, Rose B. 1985. The Rice Economy of Asia. Washington D.C., Resources for the Future.
2. Barlett PF. 1976. “Labor efficiency and the mechanism of agricultural evolution.” Journal of Anthropological Research 32:124-140.
3. Bender B. 1975. Farming in prehistory. From hunter-gatherer to food producer. London, John Baker
4. Boserup E. 1965. The conditions of agricultural growth. Chicago, Aldine
5. Boserup E. 1981. Population and Technical Change: A Study of Long-Term Trends. Chicago, University of Chicago Press.