American Association of State Highway and Transportation Officials, & American Association of State Highway and Transportation Officials. (1997). Highway safety design and operations guide, 1997. Washington, D.C.: American Association of State Highway and Transportation Officials.
Citación estilo ChicagoAmerican Association of State Highway and Transportation Officials, y American Association of State Highway and Transportation Officials. Highway Safety Design and Operations Guide, 1997. Washington, D.C.: American Association of State Highway and Transportation Officials, 1997.
Cita MLAAmerican Association of State Highway and Transportation Officials, y American Association of State Highway and Transportation Officials. Highway Safety Design and Operations Guide, 1997. Washington, D.C.: American Association of State Highway and Transportation Officials, 1997.