1. Altieri, M. A. (1995). Agroecology: The Science of sustainable agriculture. Boulder: Westview Press.
2. Andiscott, T. M. (1995). Entropy and sustainability. European Journal of Soil Science, 46, 161–168.
3. Best, G. (1997). Food security from an energy standpoint. Occasional paper. Rome: Food and Agriculture Organization.
4. Bonny, S. (1993). Is agriculture using more and more energy? A French case study. Agricultural Systems, 43, 51–66.
5. Brown, L. R. (2001). Who will feed China? Wakeup call for a small planet. New York: W. W. Norton.