APA (7th ed.) Citation

Sprague, L. A., & Gronberg, J. M. (2013). Estimation of anthropogenic nitrogen and phosphorus inputs to the land surface of the conterminous United States--1992,1997, and 2002. U.S. Department of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Sprague, Lori A., and JoAnn M. Gronberg. Estimation of Anthropogenic Nitrogen and Phosphorus Inputs to the Land Surface of the Conterminous United States--1992,1997, and 2002. Reston, Virginia: U.S. Department of the Interior, U.S. Geological Survey, 2013.

MLA (9th ed.) Citation

Sprague, Lori A., and JoAnn M. Gronberg. Estimation of Anthropogenic Nitrogen and Phosphorus Inputs to the Land Surface of the Conterminous United States--1992,1997, and 2002. U.S. Department of the Interior, U.S. Geological Survey, 2013.