University of South Florida Water Institute. "Trophic State Index (TSI)". Learn More About Trophic State Index (TSI) - Lake.WaterAtlas.org. University of South Florida. Retrieved 6 June 2018.
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Dodds, Walter K. (2010). Freshwater ecology : concepts and environmental applications of limnology. Whiles, Matt R. (2nd ed.). Burlington, MA: Academic Press. ISBN978-0-12-374724-2. OCLC784140625.