APA (7th ed.) Citation

National Water-Quality Assessment Program (U.S.) & Sprague, L. A. (2009). Nutrient trends in streams and rivers of the United States, 1993-2003. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

National Water-Quality Assessment Program (U.S.) and Lori A. Sprague. Nutrient Trends in Streams and Rivers of the United States, 1993-2003. Reston, Va.: U.S. Geological Survey, 2009.

MLA (9th ed.) Citation

National Water-Quality Assessment Program (U.S.) and Lori A. Sprague. Nutrient Trends in Streams and Rivers of the United States, 1993-2003. U.S. Geological Survey, 2009.