Lua APA (7ú heag.)

National Research Council (U.S.). Transportation Research Board & National Research Council (U.S.). Transportation Resear. (2002). Traffic control devices, visibility, and rail-highway grade crossings 2002. Transportation Research Board.

Lua i Stíl Chicago (17ú heag.)

National Research Council (U.S.). Transportation Research Board agus National Research Council (U.S.). Transportation Resear. Traffic Control Devices, Visibility, and Rail-highway Grade Crossings 2002. Washington, D.C: Transportation Research Board, 2002.

Lua MLA (9ú heag.)

National Research Council (U.S.). Transportation Research Board agus National Research Council (U.S.). Transportation Resear. Traffic Control Devices, Visibility, and Rail-highway Grade Crossings 2002. Transportation Research Board, 2002.

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