1. AWWA 1999 Recommended Practice for Backflow Prevention and Cross-connection Control. Denver
2. Feasibility of Biological Warfare Against Public Water Supplies;Berger;Jour. AWWA,1955
3. Clark , R.M. Deininger R.A. Minimizing the Vulnerability of Water Supplies to Natural and Terrorist Threats Proc. 2001 AWWA IMTech Conference Atlanta
4. Contaminant Propagation in Distribution Systems;Clark;Jour. Envir. Engrg.,1988