APA

Transportation Research Record nr 628, . (1977). Lighting, visibility, and railroad-highway grade crossings. Washington DC: Transportation Research Record nr 628.

Chicago

Transportation Research Record nr 628, . 1977. Lighting, visibility, and railroad-highway grade crossings. Washington DC: Transportation Research Record nr 628.

Harvard

Transportation Research Record nr 628, . (1977). Lighting, visibility, and railroad-highway grade crossings. Washington DC: Transportation Research Record nr 628.

MLA

Transportation Research Record nr 628, . Lighting, visibility, and railroad-highway grade crossings. Washington DC: Transportation Research Record nr 628. 1977.