APA (7th ed.) Citation

National Natural Landmarks Program (U.S.). Wildlife and Vegetation Division. & United States. National Park Service. (1989). National registry of natural landmarks 1989. U.S. Dept. of the Interior : [U.S. G.P.O.].

Chicago Style (17th ed.) Citation

National Natural Landmarks Program (U.S.). Wildlife and Vegetation Division., and United States. National Park Service. National Registry of Natural Landmarks 1989. [Washington, D.C.]: U.S. Dept. of the Interior : [U.S. G.P.O.], 1989.

MLA (8th ed.) Citation

National Natural Landmarks Program (U.S.). Wildlife and Vegetation Division., and United States. National Park Service. National Registry of Natural Landmarks 1989. U.S. Dept. of the Interior : [U.S. G.P.O.], 1989.