APA (7th ed.) Citation

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.) Citation

Roen, 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.) Citation

Roen, 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.