1. Ali, M. B., and McBride, W. D. (1990). Soybeans: State Level Production Costs, Characteristics, and Input Use. Economic Research Service. Stock no. ERS SB873. 48 pp.
2. Arkenol (2004). Our Technology: Concentrated Acid Hydrolysis. August 2, 2004: http://www.arkenol.com/Arkenol%20Inc/tech01.html .
3. Arnold, J. E. M., and Jongma, J. (2007). Fuelwood and Charcoal in Developing Countries: An Economic Survey. January 29, 2008; http://www/fap\o.org/docrep/12015e01.htm .
4. Artuzi, J. P., and Contiero, R. L. (2006). Herbicides Applied in Soybean and the Productivity of Corn in Succession. Pesquisa Agronpecuaria Brasilera 41: 71119–1123.
5. Barbara, J. S. (2007). The False Promise of Biofuels. Special Report from the International Forum on Globalization and the Institute for Policy Studies. 30 pp.