1. R.L. Dick Statement for the Record of Ronald L. Dick, Deputy Assistant Director, Counter Terrorism Division, and Director, National Infrastructure Protection Center, Federal Bureau of investigation Before the House Committee on Transportation and Infrastructure Subcommittee on Water Resources and Environment, October 10, 2001.
2. C. Whitman, Environmental News Whitman Allays Fears for Water Security; Possibility of Successful Contamination is Small, EPA Press Release Thursday, October 18, 2001.
3. Water supply facilities and national defense;Hoover;J. AWWA,1941
4. 2014 Elk River Chemical Spill. Wikipedia. https://en.wikipedia.org/wiki/2014_Elk_River_chemical_spill.
5. GAO-04-29, Drinking Water Security: Experts’ Views on How Future Federal Funding Can Best Be Spent to Improve Security, October 2003.