APA (7th ed.) Citation

Trimble, D. E., & Machette, M. N. (1979). Geologic map of the Colorado Springs - Castle Rock area, Front Range urban corridor, Colorado. The Survey.

Chicago Style (17th ed.) Citation

Trimble, Donald E., and Michael N. Machette. Geologic Map of the Colorado Springs - Castle Rock Area, Front Range Urban Corridor, Colorado. Reston, Va.: The Survey, 1979.

MLA (9th ed.) Citation

Trimble, Donald E., and Michael N. Machette. Geologic Map of the Colorado Springs - Castle Rock Area, Front Range Urban Corridor, Colorado. The Survey, 1979.