(1972). The changeable-message concept of traffic control: Report of a conference held July 15-16, 1971. Highway Research Board, National Research Council.
Citazione stile Chigago Style (17a edizione)The Changeable-message Concept of Traffic Control: Report of a Conference Held July 15-16, 1971. Washington, D.C: Highway Research Board, National Research Council, 1972.
Citatione MLA (9a ed.)The Changeable-message Concept of Traffic Control: Report of a Conference Held July 15-16, 1971. Highway Research Board, National Research Council, 1972.
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