Não informado. (2004). Highways and Road Construction. IPC Business Press.
Chicago-referens (17:e uppl.)Não informado. Highways and Road Construction. London: IPC Business Press, 2004.
MLA-referens (8:e uppl.)Não informado. Highways and Road Construction. IPC Business Press, 2004.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.