APA (7th ed.) Citation

Grout, F. F., Sharp, R. P., & Schwartz, G. M. (1959). The geology of Cook County, Minnesota. University of Minnesota Press.

Chicago Style (17th ed.) Citation

Grout, Frank F., Robert P. Sharp, and George M. Schwartz. The Geology of Cook County, Minnesota. Minneapolis: University of Minnesota Press, 1959.

MLA (9th ed.) Citation

Grout, Frank F., et al. The Geology of Cook County, Minnesota. University of Minnesota Press, 1959.