1. Renewable Fuel Association. Industry Statistics—Monthly Fuel Ethanol Production/Demandhttp://ethanolrfa.org/pages/monthly-fuel-ethanol-production-demand
2. The Energy Independence and Security Act of 2007 (H.R.6)http://www.gpo.gov/fdsys/pkg/BILLS-110hr6enr/pdf/BILLS-110hr6enr.pdf
3. http://www.nationalaglawcenter.org/assets/crs/RL33290.pdf
4. An overview of biofuel policies across the world
5. Global Agricultural Supply and Demand: Factors Contributing to the Recent Increase in Food Commodity Prices;Trostle,2008