1. State of the environment report-2007-Vol. 1.
2. Elements: A review of production, processing, recycling, and associated environmental issues, EPA United States Environmental Protection Agency (2012);Rare Earth;EPA 600/R-12/572 | December,2012
3. http://indiatoday.intoday.in/story/toxic-minerals-panmana-village-kerala/1/335460.html.
4. http://www.ndtv.com/article/south/toxic-industrial-waste-contaminates-water-poisons-lives-in-kerala-s-kollam-district-486912.
5. Chapter 43 B, Environment, Integrated District Development Plan, Kollam.