APA (7th ed.) Citation

United States. National Park Service. (2011). National park system map and guide. U.S. Department of the Interior, National Park Service.

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

United States. National Park Service. National Park System Map and Guide. U.S. Department of the Interior, National Park Service, 2011.