APA (7th ed.) Citation

Shivers, M. J., & Andrews, W. J. (2013). Hydrologic drought of water year 2011 compared to four major drought periods of the 20th century in Oklahoma. U.S. Department of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Shivers, Molly J., and William J. Andrews. Hydrologic Drought of Water Year 2011 Compared to Four Major Drought Periods of the 20th Century in Oklahoma. Reston, Virginia: U.S. Department of the Interior, U.S. Geological Survey, 2013.

MLA (9th ed.) Citation

Shivers, Molly J., and William J. Andrews. Hydrologic Drought of Water Year 2011 Compared to Four Major Drought Periods of the 20th Century in Oklahoma. U.S. Department of the Interior, U.S. Geological Survey, 2013.