Geological Survey (U.S.), University of Texas at Austin. Bureau of Economic Geology, & Hackley, P. C. (2007). Thermal maturity of Pennsylvanian coals and coaly shales, eastern shelf and Fort Worth basin, Texas. U.S. Geological Survey.
Chicago Style (17th ed.) CitationGeological Survey (U.S.), University of Texas at Austin. Bureau of Economic Geology, and Paul C. Hackley. Thermal Maturity of Pennsylvanian Coals and Coaly Shales, Eastern Shelf and Fort Worth Basin, Texas. Reston, Va.: U.S. Geological Survey, 2007.
MLA (9th ed.) CitationGeological Survey (U.S.), et al. Thermal Maturity of Pennsylvanian Coals and Coaly Shales, Eastern Shelf and Fort Worth Basin, Texas. U.S. Geological Survey, 2007.
Warning: These citations may not always be 100% accurate.