APA (7th ed.) Citation

Crockett, R. N., & Sutphin, D. M. (1993). International Strategic Minerals Inventory summary report: Niobium (columbium) and tantalum. U.S. Department of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Crockett, R. N., and David M. Sutphin. International Strategic Minerals Inventory Summary Report: Niobium (columbium) and Tantalum. [Reston, Virginia]: U.S. Department of the Interior, U.S. Geological Survey, 1993.

MLA (9th ed.) Citation

Crockett, R. N., and David M. Sutphin. International Strategic Minerals Inventory Summary Report: Niobium (columbium) and Tantalum. U.S. Department of the Interior, U.S. Geological Survey, 1993.