Rupert, M. G., & Plummer, L. N. (2009). Groundwater quality, age, and probability of contamination, Eagle River watershed valley-fill aquifer, north-central Colorado, 2006-2007. U.S. Geological Survey.
Chicago Style (17th ed.) CitationRupert, Michael G., and L. Niel Plummer. Groundwater Quality, Age, and Probability of Contamination, Eagle River Watershed Valley-fill Aquifer, North-central Colorado, 2006-2007. Reston, Va.: U.S. Geological Survey, 2009.
MLA (9th ed.) CitationRupert, Michael G., and L. Niel Plummer. Groundwater Quality, Age, and Probability of Contamination, Eagle River Watershed Valley-fill Aquifer, North-central Colorado, 2006-2007. U.S. Geological Survey, 2009.
Warning: These citations may not always be 100% accurate.