Não informado. (1974). American Highway and Transportation Monthly. American Association of State Highway and Transportation Officials.
Chicago-referens (17:e uppl.)Não informado. American Highway and Transportation Monthly. Washington: American Association of State Highway and Transportation Officials, 1974.
MLA-referens (8:e uppl.)Não informado. American Highway and Transportation Monthly. American Association of State Highway and Transportation Officials, 1974.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.