APA (7th ed.) Citation

(1940). Big bend: National park service. 194-. United States. Department of the Interior.

Chicago Style (17th ed.) Citation

Big Bend: National Park Service. 194-. Washington, D.C.: United States. Department of the Interior, 1940.

MLA (9th ed.) Citation

Big Bend: National Park Service. 194-. United States. Department of the Interior, 1940.

Warning: These citations may not always be 100% accurate.