National Research Council (U.S.). Transportation Research Board & National Research Council (U.S.). Transportation Research Board. Meeting. (2003). Traffic control devices, visibility, and rail-highway grade crossings, 2003. Transportation research record.
Citazione stile Chigago Style (17a edizione)National Research Council (U.S.). Transportation Research Board e National Research Council (U.S.). Transportation Research Board. Meeting. Traffic Control Devices, Visibility, and Rail-highway Grade Crossings, 2003. Washington, D.C: Transportation research record, 2003.
Citatione MLA (9a ed.)National Research Council (U.S.). Transportation Research Board e National Research Council (U.S.). Transportation Research Board. Meeting. Traffic Control Devices, Visibility, and Rail-highway Grade Crossings, 2003. Transportation research record, 2003.