1. Engelder, T.Marcellus 2008: Report card on the breakout year for gas production in the Appalachian Basin.Fort Worth Basin Oil and Gas Magazine, 2009, 20.
2. Considine, T., Watson, R., Entler, R., and Sparks, J.An emerging giant: prospects and economic impacts for developing Marcellus Shale. Penn State University, 2009