National Research Council (U.S.). Transportation Research Board & National Research Council (U.S.). Transportation Research Board. Meeting. (2006). Traffic control devices, visibility, and rail-highway grade crossings, 2006. Transportation Research Board.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNational Research Council (U.S.). Transportation Research Board और National Research Council (U.S.). Transportation Research Board. Meeting. Traffic Control Devices, Visibility, and Rail-highway Grade Crossings, 2006. Washington, D.C: Transportation Research Board, 2006.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNational Research Council (U.S.). Transportation Research Board और National Research Council (U.S.). Transportation Research Board. Meeting. Traffic Control Devices, Visibility, and Rail-highway Grade Crossings, 2006. Transportation Research Board, 2006.