National Research Council (U.S.). Transportation Research Board, National Cooperative Highway Research Program, & Harkey, D. L. (2005). Crash reduction factors for traffic engineering and intelligent transportation system (ITS improvements): State-of knowledge report. Transportation Research Board.
Chicago-referens (17:e uppl.)National Research Council (U.S.). Transportation Research Board, National Cooperative Highway Research Program, och David L. Harkey. Crash Reduction Factors for Traffic Engineering and Intelligent Transportation System (ITS Improvements): State-of Knowledge Report. Washington, D.C: Transportation Research Board, 2005.
MLA-referens (9:e uppl.)National Research Council (U.S.). Transportation Research Board, et al. Crash Reduction Factors for Traffic Engineering and Intelligent Transportation System (ITS Improvements): State-of Knowledge Report. Transportation Research Board, 2005.