1. Bureau of Economic Analysis (BEA). (2011). National income and product accounts-NIPAs, 2011. Section 1 all tables. GDP and Other Major NIPA Aggregates. U.S. Department of Commerce. http://www.bea.gov/.
2. 1994 Manufacturing Consumption of Energy 1994;Energy Information Administration (EIA),1997
3. 2002 Manufacturing Energy Consumption Survey on manufacturing and industrial energy uses and costs;Energy Information Administration (EIA),2005
4. 2006 Manufacturing Energy Consumption Survey on manufacturing and industrial energy uses and costs;Energy Information Administration (EIA),2009
5. Prices;Energy Information Administration (EIA),2012