APA (7th ed.) Citation

United States. National Park Service. (2011). National park system map and guide ([2011 rev. ed.].). U.S. Dept. of the Interior, National Park Service.

Chicago Style (17th ed.) Citation

United States. National Park Service. National Park System Map and Guide. [2011 rev. ed.]. [Washington, DC]: U.S. Dept. of the Interior, National Park Service, 2011.

MLA (8th ed.) Citation

United States. National Park Service. National Park System Map and Guide. [2011 rev. ed.]. U.S. Dept. of the Interior, National Park Service, 2011.