APA (7th ed.) Citation

United States. National Park Service. (1939). Carlsbad Caverns National Park and vicinity, New Mexico. Dept. of the Interior, National Park Service.

Chicago Style (17th ed.) Citation

United States. National Park Service. Carlsbad Caverns National Park and Vicinity, New Mexico. [Washington, D.C.]: Dept. of the Interior, National Park Service, 1939.

MLA (8th ed.) Citation

United States. National Park Service. Carlsbad Caverns National Park and Vicinity, New Mexico. Dept. of the Interior, National Park Service, 1939.