1. Marcellus Education Fact Sheet: Water Withdrawals for Development of Marcellus Shale Gas in Pennsylvania;Abdalla,2010
2. Land application of hydrofracturing fluids damages a deciduous forest stand in West Virginia;Adams;J. Environ. Qual.,2011
3. ALS, 2013. State Fracking Regulations. (viewed 24 January 2014).
4. Bloomberg, 2013. “Halliburton Cut Fracking Water Costs by $400,000 a Bakken Well,” by David Wethe. (5 March 2013).
5. Water resource impacts during unconventional shale gas development: the Pennsylvania experience;Brantley;Int. J. Coal Geol,2014