Davis, Mackenzie L., and Susan J. Masten. Principles of Environmental
Engineering and Science. First ed. McGraw-Hill Science Engineering Math, 2003.
Tchobanoglous, George, and Edward D. Schroeder. Water Quality. Addison Wesley
Environmental Leverage. "Nitrification -Why a Total Nitrogen balance is important! [Online] May 2, 2008 "
EAS. Observing the Earth. "Earth from Space: Bloom in the Baltic" [Online] Apr 27, 2008
EPA. Constructed Wetlands for Wastewater Treatment and Wildlife Habitat [Online] Apr 27, 2008
EPA. Wastewater Technology Fact Sheet Ammonia Stripping [Online] Apr 27, 2008
FAO. Corporate Document Repository. "Wastewater use case studies" [Online] Apr 27, 2008
Brown and Caldwell. "Groundwater Recharge for Orange County, California" [Online] May 8, 2008 http://www.bcwaternews.com/waterresources/P-631-0202a_(Groundwater%20Recharge).pdf
"Membrane Filtration." A National Drinking Water Clearinghouse Fact Sheet [Online] May 2, 2008 http://www.nesc.wvu.edu/ndwc/pdf/OT/TB/TB10_membrane.pdf
"ROC SERIES." Reverse Osmosis System Advanced Membrane Cleaning [Online] May 8, 2008 http://www.lighthousefilters.com/reverse.html
"Nitrogen Cycle." Microbial Life Education Resources. 2005 [Online] May 2, 2008 http://serc.carleton.edu/microbelife/microbservatories/northinlet/diaz.html
"Trickling Filters." Onsite Wastewater Treatment and Reuse [Online] May 8, 2008