APA (7th ed.) Citation

Geological Survey (U.S.), Denson, N. M., Gibson, M. L., & Sims, G. L. (1993). Geologic and structure map, with contours on top of the Pierre Shale, for the south half of the Powder River Basin, northeastern Wyoming. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.), N. M. Denson, M. L. Gibson, and G. L. Sims. Geologic and Structure Map, with Contours on top of the Pierre Shale, for the South Half of the Powder River Basin, Northeastern Wyoming. Reston, VA: The Survey, 1993.

MLA (9th ed.) Citation

Geological Survey (U.S.), et al. Geologic and Structure Map, with Contours on top of the Pierre Shale, for the South Half of the Powder River Basin, Northeastern Wyoming. The Survey, 1993.