APA (7th ed.) Citation

Geological Survey (U.S.), Gaskill, D. L., DeLong, J. E., & Cochran, D. M. (1987). Geologic map of the Mt. Axtell quadrangle, Gunnison County, Colorado. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.), David L. Gaskill, J. E. DeLong, and Dale M. Cochran. Geologic Map of the Mt. Axtell Quadrangle, Gunnison County, Colorado. Reston, Va.: The Survey, 1987.

MLA (9th ed.) Citation

Geological Survey (U.S.), et al. Geologic Map of the Mt. Axtell Quadrangle, Gunnison County, Colorado. The Survey, 1987.