APA (7th ed.) Citation

National Geographic Maps (Firm), Trails Illustrated (Firm), & Geological Survey (U.S.). (2001). Poudre River, Cameron Pass: Colorado, USA (Rev. 2001.). National Geographic Maps.

Chicago Style (17th ed.) Citation

National Geographic Maps (Firm), Trails Illustrated (Firm), and Geological Survey (U.S.). Poudre River, Cameron Pass: Colorado, USA. Rev. 2001. Evergreen, Colo.: National Geographic Maps, 2001.

MLA (8th ed.) Citation

National Geographic Maps (Firm), et al. Poudre River, Cameron Pass: Colorado, USA. Rev. 2001. National Geographic Maps, 2001.