1. EIA. Natural Gas 1998 Issues and Trends; DOE/EIA-0560, 1998; 242 pp.
2. EIA. Natural Gas Gross Withdrawals and Production;http://www.eia.gov/dnav/ng/ng_prod_sum_dcu_NUS_m.htm, 2011.
3. DOE. Modern Shale Gas Development in the United States: a Primer; Report prepared by Ground Water Protection Council, Oklahoma City and ALL Consulting, Oklahoma City, for Office of Fossil Energy and NETL, U.S. Department of Energy 2009; 96 pp.
4. EIA. Annual Energy Outlook with Projections to 2035; DOE/EIA-0383, April 2011; 235 pp.
5. Methane contamination of drinking water accompanying gas-well drilling and hydraulic fracturing