1. Energy Information Administration. Annual energy outlook 2013 – Table 58 light-duty vehicle stock by technology type; 2013. Available: .
2. National Biodiesel Board. OEM information; 2015. Available: [accessed: 07-Apr-2015].
3. Environmental Protection Agency. Control of air pollution from motor vehicles: tier 3 motor vehicle emission and fuel standards; 2014.
4. Fundamental inconsistencies between federal biofuels policy and their implications;Christensen;Environ Law Rev,2014
5. California Air Resources Board. Low carbon fuel standard program; 2009. Available: [accessed: 07-Apr-2015].