Waples, D. A. (2012). The natural gas industry in Appalachia: A history from the first discovery to the tapping of the Marcellus Shale (2nd ed.). McFarland & Co..
Dyfyniad Arddull ChicagoWaples, David A. The Natural Gas Industry in Appalachia: A History from the First Discovery to the Tapping of the Marcellus Shale. 2nd ed. Jefferson, N.C.: McFarland & Co., 2012.
Dyfyniad MLAWaples, David A. The Natural Gas Industry in Appalachia: A History from the First Discovery to the Tapping of the Marcellus Shale. 2nd ed. McFarland & Co., 2012.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.