APA (7th ed.) Citation

Spechler, R. M., & Kroening, S. E. (2007). Hydrology of Polk County, Florida. U.S. Dept. of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Spechler, R. M., and Sharon E. Kroening. Hydrology of Polk County, Florida. Reston, Va.: U.S. Dept. of the Interior, U.S. Geological Survey, 2007.

MLA (9th ed.) Citation

Spechler, R. M., and Sharon E. Kroening. Hydrology of Polk County, Florida. U.S. Dept. of the Interior, U.S. Geological Survey, 2007.