APA (7th ed.) Citation

Trimble, D. E., & Machette, M. N. (1979). Geologic map of the greater Denver area, Front Range urban corridor, Colorado. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Trimble, Donald E., and Michael N. Machette. Geologic Map of the Greater Denver Area, Front Range Urban Corridor, Colorado. Reston, Va.: U.S. Geological Survey, 1979.

MLA (8th ed.) Citation

Trimble, Donald E., and Michael N. Machette. Geologic Map of the Greater Denver Area, Front Range Urban Corridor, Colorado. U.S. Geological Survey, 1979.