1. Brush, S. B. 1975. The concept of carrying capacity for systems of cultivation. Amer. Anthropol. 77: 799–810.
2. Burkill, I. H. 1935 (reprinted 1966). A Dictionary of the Economic Products of the Malay Peninsula. 2 vol. Govt. of Malaysia and Singapore, Kuala Lumpur, Malaysia.
3. Carniero, R. L. 1956 (reprinted 1960). Slash and burn agriculture: A closer look at its implications for settlement patterns. Bobbs-Merrill Reprint A-26, Indianapolis, IN.
4. Clarke, W. C. 1966. From extensive to intensive shifting cultivation: A succession from New Guinea. Ethnology 5: 347–359.
5. Conklin, H. C. 1957. Hanunoo Agriculture. FAO Forestry Development Paper No. 12, Rome.