Black Canyon of the Gunnison National Park, Colorado / National Park Service, U.S. Department of the Interior.
MLA
Service, United States. National Park. Black Canyon of the Gunnison National Park, Colorado / National Park Service, U.S. Department of the Interior. The Service, 0AD. https://collections.library.yale.edu/catalog/15818433.
APA, 6th edition
Service, U. S. N. P. (0 C.E.). Black Canyon of the Gunnison National Park, Colorado / National Park Service, U.S. Department of the Interior. [Maps]. The Service, https://collections.library.yale.edu/catalog/15818433.