APA

Transportation research record no 769, . (1980). Roadside hazards, traffic barriers and safety appurtenances. Washington, DC: Transportation research record no 769.

Chicago

Transportation research record no 769, . 1980. Roadside hazards, traffic barriers and safety appurtenances. Washington, DC: Transportation research record no 769.

Harvard

Transportation research record no 769, . (1980). Roadside hazards, traffic barriers and safety appurtenances. Washington, DC: Transportation research record no 769.

MLA

Transportation research record no 769, . Roadside hazards, traffic barriers and safety appurtenances. Washington, DC: Transportation research record no 769. 1980.