1. BGS (British Geological Survey) and DPHE (Department of Public Health Engineering), Arsenic Contamination of Groundwater in Bangladesh, Four volumes, BGS Technical Report WC/00/19, Keyworth, British Geological Survey, 2001.
2. WHO (World Health Organization) Guidelines for Drinking water Quality, second ed., vol. 1, 1993.
3. A.H. Smith, E.O. Lingas, M. Rahman, Bull. WHO, Geneva 78 (2000) 1093.
4. UNESCO—United Nations Educational, Scientific and Cultural Organization, 2005, http://www.unesco.org/water.