"Drogden Tunnel". Projects Database. Association International des Tunnels & International Tunnelling and Underground Space Association. Retrieved 14 September 2020.
"Busan Geoje Fixed Link Tunnel". Projects Database. Association International des Tunnels & International Tunnelling and Underground Space Association. Retrieved 14 September 2020.
"Parana (Hernandias) Tunnel". Projects Database. Association International des Tunnels & International Tunnelling and Underground Space Association. Retrieved 14 September 2020.
"Hampton Roads Bridge Tunnel No 2". Projects Database. Association International des Tunnels & International Tunnelling and Underground Space Association. Retrieved 14 September 2020.
Bickel, John O. (April 21, 1958). The Design and Construction of the Hampton Roads Tunnel(PDF). Joint Meeting of the Boston Society of Civil Engineers and Northeastern Section of the A.S.C.E. p. 369. Retrieved 14 September 2020.