APA (7th ed.) Citation

Johnson, R. B. (1968). Geology of the igneous rocks of the Spanish Peaks region, Colorado. U.S. Govt. Print. Off.

Chicago Style (17th ed.) Citation

Johnson, Ross B. Geology of the Igneous Rocks of the Spanish Peaks Region, Colorado. Washington: U.S. Govt. Print. Off, 1968.

MLA (9th ed.) Citation

Johnson, Ross B. Geology of the Igneous Rocks of the Spanish Peaks Region, Colorado. U.S. Govt. Print. Off, 1968.