APA (7th ed.) Citation

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

MLA (9th ed.) Citation

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