1. Manual Of Sewer Condition Classification,1980
2. Sewers And Water Mains - A National Assessment,1977
3. Background Notes In Developments In Sewer Renovation Technology;Cox,1985
4. W Andrews, Sewers - Replace Or Renovate, Tunnels And Tunnelling, (March 1982), pp 45–48.
5. Sewerage Rehabilitation Manual,1983