Cunard, R. A. (1990). Maintenance management of street and highway signs. Transportation Research Board, National Research Council.
芝加哥风格引文Cunard, Richard A. Maintenance Management of Street and Highway Signs. Washington, D.C: Transportation Research Board, National Research Council, 1990.
MLA引文Cunard, Richard A. Maintenance Management of Street and Highway Signs. Transportation Research Board, National Research Council, 1990.
警告：这些引文格式不一定是100％准确.