1. Lee , G. F. Jones-Lee , A. 1993 http://www.gfredlee.com/phealthsig_080801.pdf
2. Santa Clara Valley Water District (SCVWD) 2003 http://www.valleywater.org/Water/Water_Quality/Protecting_your_water/_Perchlorate_Information/_pdf/PerchlorateFAQ 5-21-03.pdf
3. Los Angeles Department of Water and Power (LADWP) 2003 http://www.ladwp.com/ladwp/cms/ladwp001420.jsp
4. A massive outbreak in Milwaukee of Cryptospirodium infection transmitted through public water supply;MacKenzie;N. Engl. J. Med.,1994