1. 460–364 B.C. On airs, waters and places;Hippocrates,1849
2. Water and man's health;Miller,1962
3. Filtration, disinfection, turbidity, Giardia lamblia, viruses, Legionella, and heterotrophic bacteria;National Primary Drinking Water Regulations;Federal Register,1987
4. Synthetic organic chemicals, inorganic chemicals and micro-organisms;National Primary Drinking Water Regulations;Federal Register,1985