APA (7th ed.) Citation

Elkinton, S., Caproni, L., Hoeflschweiger, J., & United States. National Park Service. (2008). The National Trails System: A grand experiment. National Park Service, U.S. Dept. of the Interior.

Chicago Style (17th ed.) Citation

Elkinton, Steven., Linnea Caproni, Janelle Hoeflschweiger, and United States. National Park Service. The National Trails System: A Grand Experiment. Washington, D.C.: National Park Service, U.S. Dept. of the Interior, 2008.

MLA (8th ed.) Citation

Elkinton, Steven., et al. The National Trails System: A Grand Experiment. National Park Service, U.S. Dept. of the Interior, 2008.