APA (7th ed.) Citation

Schmidt, J. C., & Graf, J. B. (1990). Aggradation and degradation of alluvial sand deposits, 1965 to 1986, Colorado River, Grand Canyon National Park, Arizona. Department of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Schmidt, John C., and Julia B. Graf. Aggradation and Degradation of Alluvial Sand Deposits, 1965 to 1986, Colorado River, Grand Canyon National Park, Arizona. Washington: Department of the Interior, U.S. Geological Survey, 1990.

MLA (9th ed.) Citation

Schmidt, John C., and Julia B. Graf. Aggradation and Degradation of Alluvial Sand Deposits, 1965 to 1986, Colorado River, Grand Canyon National Park, Arizona. Department of the Interior, U.S. Geological Survey, 1990.