Roen, J. B., & Kepferle, R. C. (1993). Petroleum geology of the Devonian and Mississippian black shale of eastern North America. U.S. Department of the Interior, U.S. Geological Survey.
Chicago Style (17th ed.) CitationRoen, John B., and Roy Clark Kepferle. Petroleum Geology of the Devonian and Mississippian Black Shale of Eastern North America. [Reston, Va.]: U.S. Department of the Interior, U.S. Geological Survey, 1993.
MLA (9th ed.) CitationRoen, John B., and Roy Clark Kepferle. Petroleum Geology of the Devonian and Mississippian Black Shale of Eastern North America. U.S. Department of the Interior, U.S. Geological Survey, 1993.
Warning: These citations may not always be 100% accurate.