APA (7th ed.) Citation

Brock, M. R., & Singewald, Q. D. (1968). Geologic map of the Mount Tyndall quadrangle, Custer County, Colorado. The Survey.

Chicago Style (17th ed.) Citation

Brock, M. R., and Q. D. Singewald. Geologic Map of the Mount Tyndall Quadrangle, Custer County, Colorado. Washington, D.C.: The Survey, 1968.

MLA (9th ed.) Citation

Brock, M. R., and Q. D. Singewald. Geologic Map of the Mount Tyndall Quadrangle, Custer County, Colorado. The Survey, 1968.