Readel, Karin (2000). An Estuary Gone Bad: Will the Snails Survive. Science 100; Water, An Interdisciplinary Study. UMBC Baltimore MD.
United States Environmental Protection Agency. 2011. Chapter 5 Water Quality Conditions: Monitoring & Assessment: US EPA. United States Environmental Protection Agency, Retrieved from http://water.epa.gov/type/rsl/monitoring/vms50.cfm.
Natural Resources Management and Environment Department. (2011). Chapter 3: Fertilizers as a water pollutant. FAO: Corporate Document Repository, Retrieved at http://www.fao.org/docrep/W2598E/w2598e06.htm#TopOfPage.
Chesapeake Bay Foundation (2011) 2010 Maryland's State of the Bay
Retrieved from http://www.cbf.org/Document.Doc?id=596
Chesapeake Bay Program. (July 2009). Dissolved Oxygen
Retrieved from http://www.chesapeakebay.net/do.htm