National Research Council (U.S.). Transportation Research Board, National Cooperative Highway Research Program, Pennsylvania State University. Dept. of Civil Engineering, Jovanis, P., & Gross, F. (2006). Core competencies for highway safety professionals. Transportation Research Board.
Cita Chicago (17th ed.)National Research Council (U.S.). Transportation Research Board, National Cooperative Highway Research Program, Pennsylvania State University. Dept. of Civil Engineering, Paul Jovanis, i Frank Gross. Core Competencies for Highway Safety Professionals. Washington, D.C: Transportation Research Board, 2006.
Cita MLA (9th ed.)National Research Council (U.S.). Transportation Research Board, et al. Core Competencies for Highway Safety Professionals. Transportation Research Board, 2006.