APA
Transportation Research Board. Railroad Research Information Service, . (1976). Grade crossing safety. Washington DC: Transportation Research Board. Railroad Research Information Service.
Chicago
Transportation Research Board. Railroad Research Information Service, . 1976. Grade crossing safety. Washington DC: Transportation Research Board. Railroad Research Information Service.
Harvard
Transportation Research Board. Railroad Research Information Service, . (1976). Grade crossing safety. Washington DC: Transportation Research Board. Railroad Research Information Service.
MLA
Transportation Research Board. Railroad Research Information Service, . Grade crossing safety. Washington DC: Transportation Research Board. Railroad Research Information Service. 1976.