Board, N. R. C. T. R. (1992). Traffic control devices and highway visibility. Washington, DC : National Academy Press.
Citação norma ChicagoBoard, National Research Council. Transportation Research. Traffic Control Devices and Highway Visibility. Washington, DC : National Academy Press, 1992.
Citação norma MLABoard, National Research Council. Transportation Research. Traffic Control Devices and Highway Visibility. Washington, DC : National Academy Press, 1992.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.