Cite
MLA (8th Edition)
Map of Assessed Shale Gas In the United States, 2012. U.S. Department of the Interior, U.S. Geological Survey, 2013.
APA (7th Edition)
Map of assessed shale gas in the United States, 2012. (2013). U.S. Department of the Interior, U.S. Geological Survey.
Chicago (17th Edition)
“Map of Assessed Shale Gas in the United States, 2012.” Reston, Va.: U.S. Department of the Interior, U.S. Geological Survey, 2013.