(1948). Manual on uniform traffic control devices for streets and highways. Washington, D.C: Public Poads Administration.
Παραπομπή Chicago StyleManual On Uniform Traffic Control Devices for Streets and Highways. Washington, D.C: Public Poads Administration, 1948.
Παραπομπή MLAManual On Uniform Traffic Control Devices for Streets and Highways. Washington, D.C: Public Poads Administration, 1948.
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