1. Standard Methods for the Examination of Water and Wastewater, American Public Health Association;APHA, AWW, AWEF,1995
2. Standard Methods for the Examination of Water and Wastewater;APHA, AWW, AWEF,1998
3. Cumulative impacts of landuse on water quality in a southern Appalachian watershed;Bolstad;J. Am. Water Resour. Assoc.,1997
4. A water quality index- do we dare?;Brown,1970
5. Canadian Water Quality Guidelines for the Protection of Aquatic Life: Canadian Water Quality Index 1.0 Technical Report;CCME,2001