References
- Ritter , W. F. and Harris , J. R. 1984 . “Nonpoint Source Nitrogen Loads to Delaware Lakes and Streams.” . Agricultural Wastes , 9 : 35 – 40 .
- Ritter , W. F. 1985 . “Comparison of Eutrophication Indexes for Delaware Lakes. “ . Transactions of American Society of Agricultural Engineers , 28 : 1591 – 1597 .
- American Public Health Association . 1981 . “Standard Method for the Examination of Water Pond Wastewater,” .
- Ritter , W. F. and Scheffler , G. 1977 . “Monitoring Nonpoint Source Pollution in Coastal Sussex County.” , Task Report. No. 2332 Georgetown, DE : Coastal Sussex Water Quality Management Program .
- U. S. Environmental Protection Agency . 1975 . “National Eutrophication Survey Methods, 1973–1976.” , Working Paper No. 175 Corvallis, OR : EPA National Environmental Research Center .
- U. S. Department of Agriculture . 1975 . “Agricultural Waste Management Field Manual.” , Washington, DC : USDA, SCS .