APA (7th ed.) Citation

Luppens, J. A. (2015). Coal geology and assessment of coal resources and reserves 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. Coal Geology and Assessment of Coal Resources and Reserves in the Powder River Basin, Wyoming and Montana. Reston, Virginia: U.S. Department of the Interior, U.S. Geological Survey, 2015.

MLA (9th ed.) Citation

Luppens, James A. Coal Geology and Assessment of Coal Resources and Reserves in the Powder River Basin, Wyoming and Montana. U.S. Department of the Interior, U.S. Geological Survey, 2015.