Chatfield, B. V., & Council, F. M. (1987). System-wide safety improvements: An approach to safety consistency. Transportation Research Board, National Research Council.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रChatfield, Benjamin V., और Forrest M. Council. System-wide Safety Improvements: An Approach to Safety Consistency. Washington, D.C: Transportation Research Board, National Research Council, 1987.
एमएलए (9वां संस्करण) प्रशस्ति पत्रChatfield, Benjamin V., और Forrest M. Council. System-wide Safety Improvements: An Approach to Safety Consistency. Transportation Research Board, National Research Council, 1987.
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