1Ryan S King,Dennis F Whigham,Donald E Weller,Thomas E Jordan,Paul F Kazyak.Spatial Considerations for Linking Watershed Land Cover to Ecological Indicators in Streams. Ecological Applications . 2005
2Turner,R.E.,Rabalais,N.N.Linking landscape and water quality in the Mississippi river basin for 200 years. Bioscience . 2003
3Masters,G. M.Introduction to environmental science and technology. New York . 1974
4Hill,A. R.Stream phosphorus exports from watersheds with contrasting land uses in Southern OntarioWater Resources,1981.