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.