1. Brockenbrough, R.L., and Johnston, B.G. (1974) U.S.S. Steel Design Manual.
2. Culverwell, D.R. (1989) “Comparative merits of steel and concrete forms of tunnel,” Proceedings of the Immersed Tunnel Techniques Symposium, Manchester, UK.
3. Working Group;International Tunneling Association,1993
4. Kuesel, T. (1986) “Immersed Tube Tunnels: Concept Design and Construction,” Civil Engineering Practice, Boston Society of Civil Engineers, Spring.
5. National Public Works Department (1993) “Underground Trans-port Connections (Rijkswaterstuat).”