APA

Transportation research record no 811, . (1981). Speed enforcement, visibility, and effects of traffic control measures on drivers. Washington DC: Transportation research record no 811.

Chicago

Transportation research record no 811, . 1981. Speed enforcement, visibility, and effects of traffic control measures on drivers. Washington DC: Transportation research record no 811.

Harvard

Transportation research record no 811, . (1981). Speed enforcement, visibility, and effects of traffic control measures on drivers. Washington DC: Transportation research record no 811.

MLA

Transportation research record no 811, . Speed enforcement, visibility, and effects of traffic control measures on drivers. Washington DC: Transportation research record no 811. 1981.