APA (7th ed.) Citation

Wilderness Society (U.S.). (1989). The national wilderness preservation system, 1964-1989. Wilderness Society.

Chicago Style (17th ed.) Citation

Wilderness Society (U.S.). The National Wilderness Preservation System, 1964-1989. Washington, D.C.: Wilderness Society, 1989.

MLA (9th ed.) Citation

Wilderness Society (U.S.). The National Wilderness Preservation System, 1964-1989. Wilderness Society, 1989.