APA (7th ed.) Citation

Bryant, B., McGrew, L. W., & Wobus, R. A. (1981). Geologic map of the Denver 1 x 2 quadrangle, north-central Colorado. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Bryant, Bruce, Laura W. McGrew, and Reinhard A. Wobus. Geologic Map of the Denver 1 X 2 Quadrangle, North-central Colorado. Reston, Va.: U.S. Geological Survey, 1981.

MLA (9th ed.) Citation

Bryant, Bruce, et al. Geologic Map of the Denver 1 X 2 Quadrangle, North-central Colorado. U.S. Geological Survey, 1981.