APA (7th ed.) Citation

Brock, M. R., & Barker, F. (1972). Geologic map of the Mount Harvard quadrangle, Chaffee and Gunnison Counties, Colorado. Geological Survey.

Chicago Style (17th ed.) Citation

Brock, M. R., and Fred Barker. Geologic Map of the Mount Harvard Quadrangle, Chaffee and Gunnison Counties, Colorado. Washington: Geological Survey, 1972.

MLA (8th ed.) Citation

Brock, M. R., and Fred Barker. Geologic Map of the Mount Harvard Quadrangle, Chaffee and Gunnison Counties, Colorado. Geological Survey, 1972.