APA (7th ed.) Citation

Brobst, D. A., McKelvey, V. E., & Pratt, W. P. (1973). Summary of United States mineral resources. United States Department of the Interior, Geological Survey.

Chicago Style (17th ed.) Citation

Brobst, Donald A., V. E. McKelvey, and Walden P. Pratt. Summary of United States Mineral Resources. Washington: United States Department of the Interior, Geological Survey, 1973.

MLA (9th ed.) Citation

Brobst, Donald A., et al. Summary of United States Mineral Resources. United States Department of the Interior, Geological Survey, 1973.