APA

Transportation Research Record 1240, . (1989). Current environmental research in transportation. Washington DC: Transportation Research Record 1240.

Chicago

Transportation Research Record 1240, . 1989. Current environmental research in transportation. Washington DC: Transportation Research Record 1240.

Harvard

Transportation Research Record 1240, . (1989). Current environmental research in transportation. Washington DC: Transportation Research Record 1240.

MLA

Transportation Research Record 1240, . Current environmental research in transportation. Washington DC: Transportation Research Record 1240. 1989.