National Research Council (U.S.). Transportation Research Board. (1988). Research problem statements on traffic control devices. Transportation Research Board, National Research Council.
Style de citation Chicago (17e éd.)National Research Council (U.S.). Transportation Research Board. Research Problem Statements on Traffic Control Devices. Washington, D.C: Transportation Research Board, National Research Council, 1988.
Style de citation MLA (9e éd.)National Research Council (U.S.). Transportation Research Board. Research Problem Statements on Traffic Control Devices. Transportation Research Board, National Research Council, 1988.
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