1. Brock TD Madigan MT Martinko JM Parker J. Biology of Microorganisms. 7th ed. Piscataway NJ:Prentice Hall 1994.
2. Morris RD Levin R. Estimating the incidence of waterborne infectious disease related to drinking water in the United States. In: Assessing and Managing Health Risks from Drinking Water Contamination: Approaches and Applications (Reichard EG Zapponi GA eds). IAHS Pubi no 233. Wallingford UK: International Association of Hydrological Sciences 1995;75-88.
3. Ford TE Colwell RR eds. A Global Decline in Microbiological Safety of Water. Washington: American Academy of Microbiology 1996.
4. Ford TE. The microbial ecology of water distribution and outfall systems. In: Aquatic Microbiology; an Ecological Approach (Ford TE ed). Boston:Blackwell 1 993;455482.
5. Craun GF ed. Safety of Water Disinfection: Balancing Chemical and Microbiological Risks. Washington:ISLI Press 1993.