APA

Transportation Research Record 1247, . (1989). Visibility criteria for signs, signals, and roadway lighting. Washington DC: Transportation Research Record 1247.

Chicago

Transportation Research Record 1247, . 1989. Visibility criteria for signs, signals, and roadway lighting. Washington DC: Transportation Research Record 1247.

Harvard

Transportation Research Record 1247, . (1989). Visibility criteria for signs, signals, and roadway lighting. Washington DC: Transportation Research Record 1247.

MLA

Transportation Research Record 1247, . Visibility criteria for signs, signals, and roadway lighting. Washington DC: Transportation Research Record 1247. 1989.