APA (7th ed.) Citation

Kolpin, D. W., Burkart, M. R., & Thurman, E. M. (1994). Herbicides and nitrate in near-surface aquifers in the midcontinental United States, 1991. U.S. G.P.O..

Chicago Style (17th ed.) Citation

Kolpin, Dana W., M. R. Burkart, and E. M. Thurman. Herbicides and Nitrate in Near-surface Aquifers in the Midcontinental United States, 1991. [Washington, D.C.?]: U.S. G.P.O., 1994.

MLA (9th ed.) Citation

Kolpin, Dana W., et al. Herbicides and Nitrate in Near-surface Aquifers in the Midcontinental United States, 1991. U.S. G.P.O., 1994.