(1978). Manual on uniform traffic control devices for streets and highways. Washington, D C: U S Department of Transportation.
Citazione stile Chigago Style (17a edizione)Manual on Uniform Traffic Control Devices for Streets and Highways. Washington, D C: U S Department of Transportation, 1978.
Citatione MLA (9a ed.)Manual on Uniform Traffic Control Devices for Streets and Highways. Washington, D C: U S Department of Transportation, 1978.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.