1. Energy Information Administration, Short-Term Energy Outlook. http://www.eia.gov/forecasts/steo/report/us_oil.cfm; 2015, March.
2. EIA, Monthly Energy Review. http://www.eia.gov/tools/faqs/faq.cfm, 2013, April.
3. EIA. U.S. Energy Information Administration Petroleum Database, http://www.eia.gov/petroleum/; 2015.
4. Department of Energy, Biomass as feedstock for a bioenergy and bioproducts industry: the technical feasibility of a billion-ton annual supply. Document Number: DOE/GO-102005-2135, http://www1.eere.energy.gov/biomass/publications.html; 2005.
5. Energy Information Administration, Annual Energy Outlook 2013 with Projections to 2035. Document Number: DOE/EIA-0383. http://www.eta.doe.gov/oiaf/aeo/; 2012.