APA (7th ed.) Citation

Luppens, J. A. (2013). Assessment of coal geology, resources, and reserve base in the Powder River Basin, Wyoming and Montana. U.S. Department of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Luppens, James A. Assessment of Coal Geology, Resources, and Reserve Base in the Powder River Basin, Wyoming and Montana. [Reston, Va.]: U.S. Department of the Interior, U.S. Geological Survey, 2013.

MLA (9th ed.) Citation

Luppens, James A. Assessment of Coal Geology, Resources, and Reserve Base in the Powder River Basin, Wyoming and Montana. U.S. Department of the Interior, U.S. Geological Survey, 2013.