APA

Transportation Research Record nr 611, . (1976). Railroad-highway crossings, visibility, and human factors. Washington DC: Transportation Research Record nr 611.

Chicago

Transportation Research Record nr 611, . 1976. Railroad-highway crossings, visibility, and human factors. Washington DC: Transportation Research Record nr 611.

Harvard

Transportation Research Record nr 611, . (1976). Railroad-highway crossings, visibility, and human factors. Washington DC: Transportation Research Record nr 611.

MLA

Transportation Research Record nr 611, . Railroad-highway crossings, visibility, and human factors. Washington DC: Transportation Research Record nr 611. 1976.