1. World Health Organization (WHO). Guidelines for drinking-water quality. 4th ed. Geneva: WHO; 2011. p. xx, 3, 161–162, 164, 177, 183, 223–224, 311, 323–324, 343, 387, 389–390, 394, 398–399, 413–415, 430, 471.
2. Greenwood NN, Earnshaw A. Chemistry of the elements. New York: Pergamon Press; 1989. p. 1496.
3. WHO (World Health Organization). World Health Organization meetings on the guidelines for drinking-water quality, 2–5 December 2013, Geneva, Switzerland. 2014. http://www.who.int/entity/water_sanitation_health/dwq/GDWQ_2013_Repor_microbial_aspects.pdf. Accessed June 17 2014.
4. WHO (World Health Organization). World Health Organization water quality and health joint expert meeting, 18–22 March 2013, Dübendorf, Switzerland. 2013. http://www.who.int/entity/water_sanitation_health/dwq/GDWQ_2013_Meeting_Report.pdf. Accessed December 3 2014.
5. WHO (World Health Organization). Meeting on the guidelines for drinking-water quality, 5–7 June 2014, Singapore. 2014. http://www.who.int/entity/water_sanitation_health/dwq/Singapore_meeting_report_2014.pdf. Accessed November 11 2014.