APA (7th ed.) Citation

Geological Survey (U.S.) & Ruppert, L. (2002). Coal resources of selected coal beds and zones in the northern and central Appalachian Basin. [publisher not identified].

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and Leslie Ruppert. Coal Resources of Selected Coal Beds and Zones in the Northern and Central Appalachian Basin. [Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey: [publisher not identified], 2002.

MLA (9th ed.) Citation

Geological Survey (U.S.) and Leslie Ruppert. Coal Resources of Selected Coal Beds and Zones in the Northern and Central Appalachian Basin. [publisher not identified], 2002.