APA (7th ed.) Citation

United States. National Park Service. (1988). National park system map and guide. The Service.

Chicago Style (17th ed.) Citation

United States. National Park Service. National Park System Map and Guide. [Washington, D.C.]: The Service, 1988.

MLA (9th ed.) Citation

United States. National Park Service. National Park System Map and Guide. The Service, 1988.

Warning: These citations may not always be 100% accurate.