APA (7th ed.) Citation

United States. National Park Service, National Recreation and Park Association (U.S.), Park Practice Program (U.S.), National Conference on State Parks (U.S.), United States. Heritage Conservation and Recreation Service, & National Society for Park Resources (U.S.). Design. The Service.

Chicago Style (17th ed.) Citation

United States. National Park Service, National Recreation and Park Association (U.S.), Park Practice Program (U.S.), National Conference on State Parks (U.S.), United States. Heritage Conservation and Recreation Service, and National Society for Park Resources (U.S.). Design. Washington, D.C.: The Service.

MLA (8th ed.) Citation

United States. National Park Service, et al. Design. The Service.