1. EIA. U.S. Energy Information Administration; 2011. 〈www.eia.gov/mer〉.
2. EIA. U.S Energy Information Administration; 2011. 〈http://www.eia.gov/forecasts/aeo/er/pdf/0383er(2013).pdf〉 .
3. Press DAU. Systems Engineering Fundamentals; 2001. 〈http://spacese.spacegrant.org/SEModules/Reference%20Docs/DAU_SE_Fundamentals.pdf〉.
4. AbsoluteAstronomy.com. Biodiesel production; 2012. 〈www.absoluteastronomy.com/topics/Biodiesel_production〉.
5. Biodiesel: an overview;Pinto;Journal of the Brazilian Chemical Society.,2005