APA (7th ed.) Citation

Kalkhoff, S. J., & Schaap, B. D. (1996). Agricultural chemicals in ground and surface water in a small watershed in Clayton County, Iowa, 1988-91. U.S. Dept. of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Kalkhoff, Stephen J., and Bryan D. Schaap. Agricultural Chemicals in Ground and Surface Water in a Small Watershed in Clayton County, Iowa, 1988-91. Iowa City, Iowa: U.S. Dept. of the Interior, U.S. Geological Survey, 1996.

MLA (9th ed.) Citation

Kalkhoff, Stephen J., and Bryan D. Schaap. Agricultural Chemicals in Ground and Surface Water in a Small Watershed in Clayton County, Iowa, 1988-91. U.S. Dept. of the Interior, U.S. Geological Survey, 1996.