1. Annual Energy Outlook 2013 with Projections to 2040;United States Energy Information Administration:Washington DC, 2013.http://www.eia.gov/forecasts/aeo/pdf/0383(2013).pdf(accessed Oct 6, 2016).
2. U.S. States: State Profiles and Energy Estimates; UnitedStates Energy Information Administration Website. https://www.eia.gov/state/rankings/#/series/47(accessed Oct 6, 2016).
3. U.S. States: State Profiles and Energy Estimates; UnitedStates Energy Information Administration Website. https://www.eia.gov/state/rankings/#/series/46(accessed March 24, 2016) .
4. Staff Report: April 28, 2014;Colorado Oil and Gas Conservation Commission:Denver, CO, 2014.http://cogcc.state.co.us/documents/library/Staff_Reports/2014/201404_StaffReport.pdf(accessed Oct 6, 2016).
5. Discover Weld County Colorado; Weld County Government Website. http://www.discoverweld.com/aboutweldcounty.html(accessed Oct 6, 2016).