APA (7th ed.) Citation

Cathcart, J. B., Sheldon, R. P., & Gulbrandsen, R. A. (1984). Phosphate-rock resources of the United States. Geological Survey.

Chicago Style (17th ed.) Citation

Cathcart, James Bachelder, Richard Porter Sheldon, and Robert A. Gulbrandsen. Phosphate-rock Resources of the United States. Alexandria, VA: Geological Survey, 1984.

MLA (9th ed.) Citation

Cathcart, James Bachelder, et al. Phosphate-rock Resources of the United States. Geological Survey, 1984.