1. Water Quality Association, Technical Application Bulletin, Fluoride, prepared by Water Quality Association, Lisle, IL, 2004, http://www.wqa.org/pdf/TechBulletins/TB-Fluoride.pdf.
2. Concise Inorganic Chemistry;Lee J.D.,2005
3. A history of water fluoridation
4. Guidelines for Drinking Water Quality, First Addendum to Third edition, vol. 1, WHO, Geneva, 2006, p. 375.
5. US Public Health Service Drinking Water Standards (USPHS), US Government Printing Office, Department of Health Education and Welfare, Washington, DC, 1962, p. 45.