APA (7th ed.) Citation

Trails Illustrated (Firm) & Geological Survey (U.S.). (1996). Big Bend National Park, Texas (Rev. 1996.). Trails Illustrated.

Chicago Style (17th ed.) Citation

Trails Illustrated (Firm) and Geological Survey (U.S.). Big Bend National Park, Texas. Rev. 1996. Evergreen, Colo.: Trails Illustrated, 1996.

MLA (9th ed.) Citation

Trails Illustrated (Firm) and Geological Survey (U.S.). Big Bend National Park, Texas. Rev. 1996. Trails Illustrated, 1996.