1. America’s pathway to sustainable water and wastewater systems;Allbee;Water Asset Management International,2005
2. ASCE. (2009). Report card for America’s infrastructure. American Society of Civil Engineers. http://www.infrastructurereportcard.org/index accessed August 2012.
3. AWWA. (2012). Buried no longer: Confronting America’s water infrastructure challenge. American water works association. http://www.awwa.org/files/GovtPublicAffairs/GADocuments/BuriedNoLongerCompleteFinal.pdf accessed 20 June 2012.
4. Chaudry, T. S., Gheorghiu, C. & Hu, Y. (2007). Field condition monitoring of water mains in the canadian prairies. National Research Council of Canada report: NRCC-50254.
5. Non-destructive technologies;Cull,2008