National Research Council (U.S.). Transportation Research Board. (1988). Research problem statements on traffic control devices. Transportation Research Board, National Research Council.
Citação do estilo Chicago (17ª ed.)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.
Citação MLA (9ª ed.)National Research Council (U.S.). Transportation Research Board. Research Problem Statements on Traffic Control Devices. Transportation Research Board, National Research Council, 1988.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.