Não informado. (2004). Transportation research circular. National Research Council, Transportation Research Board.
Chicago-referens (17:e uppl.)Não informado. Transportation Research Circular. Washington: National Research Council, Transportation Research Board, 2004.
MLA-referens (8:e uppl.)Não informado. Transportation Research Circular. National Research Council, Transportation Research Board, 2004.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.