APA

U.S. Department of Transportation. National Highway Traffic Safety Administration, . (1981). Public communicatios manual for highway safety planners. Washington DC: U.S. Department of Transportation. National Highway Traffic Safety Administration.

Chicago

U.S. Department of Transportation. National Highway Traffic Safety Administration, . 1981. Public communicatios manual for highway safety planners. Washington DC: U.S. Department of Transportation. National Highway Traffic Safety Administration.

Harvard

U.S. Department of Transportation. National Highway Traffic Safety Administration, . (1981). Public communicatios manual for highway safety planners. Washington DC: U.S. Department of Transportation. National Highway Traffic Safety Administration.

MLA

U.S. Department of Transportation. National Highway Traffic Safety Administration, . Public communicatios manual for highway safety planners. Washington DC: U.S. Department of Transportation. National Highway Traffic Safety Administration. 1981.