APA (7th ed.) Citation

Tweto, O. (1987). Rock units of the Precambrian basement in Colorado. U.S. Gov. Print. Off.

Chicago Style (17th ed.) Citation

Tweto, Ogden. Rock Units of the Precambrian Basement in Colorado. Washington, D.C: U.S. Gov. Print. Off, 1987.

MLA (9th ed.) Citation

Tweto, Ogden. Rock Units of the Precambrian Basement in Colorado. U.S. Gov. Print. Off, 1987.