APA-Zitierstil (7. Ausg.)

Ruppel, E. T. (1972). Geology of pre-tertiary rocks in the Northern part of Yellowstone National Park, Wyoming. U.S. Gov. Print. Office.

Chicago-Zitierstil (17. Ausg.)

Ruppel, Edward T. Geology of Pre-tertiary Rocks in the Northern Part of Yellowstone National Park, Wyoming. Washington, D.C: U.S. Gov. Print. Office, 1972.

MLA-Zitierstil (9. Ausg.)

Ruppel, Edward T. Geology of Pre-tertiary Rocks in the Northern Part of Yellowstone National Park, Wyoming. U.S. Gov. Print. Office, 1972.