National Research Council (U.S.). Transportation Research Board. (1992). Bridge, culvert, and tunnel research. National Academy Press.
Lua i Stíl Chicago (17ú heag.)National Research Council (U.S.). Transportation Research Board. Bridge, Culvert, and Tunnel Research. Washington, D.C: National Academy Press, 1992.
Lua MLA (9ú heag.)National Research Council (U.S.). Transportation Research Board. Bridge, Culvert, and Tunnel Research. National Academy Press, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.