APA (7th ed.) Citation

Geological Survey (U.S.), Dicken, C. L., Pimley, S. G., Cannon, W. F., & Sims, P. K. (2001). Precambrian basement map of the northern midcontinent, U.S.A: A digital representation of the 1990 P.K. Sims map. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.), Connie L. Dicken, Shana G. Pimley, William F. Cannon, and P. K. Sims. Precambrian Basement Map of the Northern Midcontinent, U.S.A: A Digital Representation of the 1990 P.K. Sims Map. [Reston, Va.]: The Survey, 2001.

MLA (9th ed.) Citation

Geological Survey (U.S.), et al. Precambrian Basement Map of the Northern Midcontinent, U.S.A: A Digital Representation of the 1990 P.K. Sims Map. The Survey, 2001.