Roy Jorgensen Associates, National Research Council (U.S.). Transportation Research Board, American Association of State Highway and Transportation Officials, & United States. Federal Highway Administration. (1978). Cost and safety effectiveness of highway design elements. Transportation Research Board, National Research Council.
Cita Chicago (17th ed.)Roy Jorgensen Associates, National Research Council (U.S.). Transportation Research Board, American Association of State Highway and Transportation Officials, i United States. Federal Highway Administration. Cost and Safety Effectiveness of Highway Design Elements. Washington, D.C: Transportation Research Board, National Research Council, 1978.
Cita MLA (9th ed.)Roy Jorgensen Associates, et al. Cost and Safety Effectiveness of Highway Design Elements. Transportation Research Board, National Research Council, 1978.