APA (7th ed.) Citation

Geological Survey, Barnum, B. E., & Hail, W. J., Jr. (1996). Geologic map of the Gillam Draw quadrangle, Rio Blanco County, Colorado. The Survey ; For sale by Information Services.

Chicago Style (17th ed.) Citation

Geological Survey, Bruce E. Barnum, and William J. Hail, Jr. Geologic Map of the Gillam Draw Quadrangle, Rio Blanco County, Colorado. Reston, Va. : Denver, CO: The Survey ; For sale by Information Services, 1996.

MLA (8th ed.) Citation

Geological Survey, et al. Geologic Map of the Gillam Draw Quadrangle, Rio Blanco County, Colorado. The Survey ; For sale by Information Services, 1996.