APA (7th ed.) Citation

Geological Survey (U.S.), Hail, W. J., Jr., O'Sullivan, R. B., & Smith, M. C. (1989). Geologic map of the Roan Plateau area, northwestern Colorado. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.), William J. Hail, Jr, Robert Brett O'Sullivan, and Marjorie C. Smith. Geologic Map of the Roan Plateau Area, Northwestern Colorado. Reston, Va.: The Survey, 1989.

MLA (9th ed.) Citation

Geological Survey (U.S.), et al. Geologic Map of the Roan Plateau Area, Northwestern Colorado. The Survey, 1989.