APA (7th ed.) Citation

Geological Survey (U.S.), Fox, J. E., & Higley, D. K. (1996). Isopach maps of the Powder River Basin, Wyoming and Montana. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.), J. E. Fox, and Debra K. Higley. Isopach Maps of the Powder River Basin, Wyoming and Montana. [Reston, Va.]: The Survey, 1996.

MLA (9th ed.) Citation

Geological Survey (U.S.), et al. Isopach Maps of the Powder River Basin, Wyoming and Montana. The Survey, 1996.