National Research Council (U.S.). Transportation Research Board. (1998). Progress in transportation data 1998. National Academy Press.
Chicago-referens (17:e uppl.)National Research Council (U.S.). Transportation Research Board. Progress in Transportation Data 1998. Washington, D.C: National Academy Press, 1998.
MLA-referens (9:e uppl.)National Research Council (U.S.). Transportation Research Board. Progress in Transportation Data 1998. National Academy Press, 1998.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.