"Plan Your Visit". National Park Service. 2011. Retrieved November 11, 2011.
"Park History". National Park Service. Retrieved October 18, 2010.
Albright, Horace M.; Taylor, Frank J. (September 6, 2004) [1928]. "Glimpses of the National Parks and Monuments". Oh, Ranger!. illustrated by Ruth Taylor White (Centennial ed.). Riverside, Connecticut: The Chatham Press, Inc. Retrieved August 18, 2006.
Albright, Horace M.; Taylor, Frank J. (September 6, 2004) [1928]. "Glimpses of the National Parks and Monuments". Oh, Ranger!. illustrated by Ruth Taylor White (Centennial ed.). Riverside, Connecticut: The Chatham Press, Inc. Retrieved August 18, 2006.