MLA

Service, United States. National Park. Badlands National Park, South Dakota / National Park Service, U.S. Department of the Interior. The Service, 0AD. https://collections.library.yale.edu/catalog/15814748.

APA, 6th edition

Service, U. S. N. P. (0 C.E.). Badlands National Park, South Dakota / National Park Service, U.S. Department of the Interior. [Maps]. The Service, https://collections.library.yale.edu/catalog/15814748.