APA (7th ed.) Citation

Ruppel, E. T. (1972). Geology of pre-Tertiary rocks in the northern part of Yellowstone National Park, Wyoming. U.S. G.P.O..

Chicago Style (17th ed.) Citation

Ruppel, Edward Thompson. Geology of Pre-Tertiary Rocks in the Northern Part of Yellowstone National Park, Wyoming. Washington: U.S. G.P.O., 1972.

MLA (9th ed.) Citation

Ruppel, Edward Thompson. Geology of Pre-Tertiary Rocks in the Northern Part of Yellowstone National Park, Wyoming. U.S. G.P.O., 1972.