Dissanayake, C.B. (1991) The Fluoride Problem in Ground Water of Srilanka Environmental Management and Health. International Journal of Environmental Studies, 38, 195-203.
 Smith, B. (2000) The Bioaccessibility of Essential and Potentially Toxic Trace Elements in Tropical Soils from Mukono District, Uganda. Part 5, Geological Society of London Spatial Publication, Vol. 157, 885-891.
 Fordyce, F.M., Zhang, G., Green, K. and Liu, X. (2000) Soil, Grain and Water Chemistry in Relation to Human Selenium-Responsive Diseases in Enshi District, China. Applied Geochemistry, 15, 117-132.
 Wang, Z.Q. (1991) Relationship between Sources of Drinking Water, Water Quality Improvement, and Gastric Cancer Mortality in Change Country. World Journal of Gastroenterology, 4, 45-47.
 Yang, G. and Xia, Y.M. (1995) Study on Human Dietary Requirements and Safe Range of Dietary in Take of Selenium in China and Their Application to the Prevention of Related Endemic Disease. Biomedical and Environmental Sciences, 8, 187-201.
 Cheung, K.C., Poon, B.H.T., Lan, C.Y. and Wang, M.H. (2003) Assessments of Metal and Nutrient Concentrations in River Water and Sediment Collected from the Cities in the Pearl River Delta, South China. Chemosphere, 52, 1431-1440.
 Islam, M.R., Lahermo, P., Salmanin, R., Rojestaczer, S. and Peuroniami, V. (2000) Lake and Resiorvior Water Quality Affected by Metals Leaching from Tropical Soil Srilanka. Environmental Geochemistry, 39, 31-35.