APA

(19722001). Geology of Yellowstone National Park. Washington: United States Government Printing Office.

Chicago

19722001. Geology of Yellowstone National Park. Washington: United States Government Printing Office.

Harvard

(19722001). Geology of Yellowstone National Park. Washington: United States Government Printing Office.

MLA

Geology of Yellowstone National Park. Washington: United States Government Printing Office. 19722001.