APA (7th ed.) Citation

Hoffman, J. D., Buttleman, K., Ambroziak, R. A., & Cook, C. A. (1996). National geochemical data base. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Hoffman, J. D., Kim Buttleman, Russell A. Ambroziak, and Christine A. Cook. National Geochemical Data Base. [Denver, Colo.]: U.S. Geological Survey, 1996.

MLA (9th ed.) Citation

Hoffman, J. D., et al. National Geochemical Data Base. U.S. Geological Survey, 1996.