APA (7th ed.) Citation

Geological Survey (U.S.), Donnell, J. R., Yeend, W. E., & Smith, M. C. (1986). Preliminary geologic map of the Grand Valley quadrangle, Garfield County, Colorado. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.), John R. Donnell, Warren E. Yeend, and Marjorie Corrine Smith. Preliminary Geologic Map of the Grand Valley Quadrangle, Garfield County, Colorado. Reston, Va.: The Survey, 1986.

MLA (9th ed.) Citation

Geological Survey (U.S.), et al. Preliminary Geologic Map of the Grand Valley Quadrangle, Garfield County, Colorado. The Survey, 1986.