APA (7th ed.) Citation

Powell, J. W., & Brandt, A. (2002). The exploration of the Colorado River and its canyons. National Geographic.

Chicago Style (17th ed.) Citation

Powell, John Wesley, and Anthony Brandt. The Exploration of the Colorado River and Its Canyons. Washington, D.C.: National Geographic, 2002.

MLA (8th ed.) Citation

Powell, John Wesley, and Anthony Brandt. The Exploration of the Colorado River and Its Canyons. National Geographic, 2002.