APA (7th ed.) Citation

Geological Survey (U.S.), Steven, T. A., & Hail, W. J., Jr. (1989). Geologic map of the Montrose 30ʹ x 60ʹ quadrangle, southwestern Colorado. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.), Thomas A. Steven, and William J. Hail, Jr. Geologic Map of the Montrose 30ʹ X 60ʹ Quadrangle, Southwestern Colorado. Reston, Va.: The Survey, 1989.

MLA (9th ed.) Citation

Geological Survey (U.S.), et al. Geologic Map of the Montrose 30ʹ X 60ʹ Quadrangle, Southwestern Colorado. The Survey, 1989.