1. ASCE (American Society of Civil Engineers). (2013). "Report Card for America's Infrastructure." Rep. No. 978-0-7844-1037-0 Reston VA.: ASCE.
2. Najafi M. and S. Gokhale. (2005). "Trenchless Technology: Pipeline and Utility Design Construction and Renewal " McGraw-Hill New York USA.
3. PPI (Plastic Pipe Institute). (2009). "PPI Comments on Permeation of Water Pipes and on the AWWA-RF Report on Hydrocarbons." Available: http://plasticpipe.org/pdf/ppicomment-permeation-hydrocarbons.pdf (Accessed on: March 15 2013).
4. Radoszewski T. (2009). "The Failing Water Pipeline Infrastructure - We can Rebuild it Smarter Better and Greener." Trenchless Technology (August 2009).