APA

Transportation research record 2030, . (2007). Traffic control devices, visibility, and rail-highway grade crossings 2007. Washington DC: Transportation research record 2030.

Chicago

Transportation research record 2030, . 2007. Traffic control devices, visibility, and rail-highway grade crossings 2007. Washington DC: Transportation research record 2030.

Harvard

Transportation research record 2030, . (2007). Traffic control devices, visibility, and rail-highway grade crossings 2007. Washington DC: Transportation research record 2030.

MLA

Transportation research record 2030, . Traffic control devices, visibility, and rail-highway grade crossings 2007. Washington DC: Transportation research record 2030. 2007.