2005-2009 American Community Survey / Employment Status
2004 BLS Current Population Survey
2002 Survey of Business Owners
2007 U.S. Gulf Oil Imports
2007 CEA Energy & Greenhouse Gas Emissions Impact
Bureau of Transportation Statistics (BTS) Omnibus Household Survey
Reason Foundation – The Quiet Success: Telecommuting’s Impact on Transportation and Beyond (2005)
Energy Information Administration – How Gas Is Formed