(1978). Manual on uniform traffic control devices for streets and highways. Washington, D C: U S Department of Transportation.
Citação norma ChicagoManual on Uniform Traffic Control Devices for Streets and Highways. Washington, D C: U S Department of Transportation, 1978.
Citação norma MLAManual on Uniform Traffic Control Devices for Streets and Highways. Washington, D C: U S Department of Transportation, 1978.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.