National Cooperative Highway Research Program, National Research Council (U.S.). Transportation Research Board, & Potts, I. B. (2004). Safety of U-turns at unsignalized median openings. Transportation Research Board.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNational Cooperative Highway Research Program, National Research Council (U.S.). Transportation Research Board, और Ingrid B. Potts. Safety of U-turns at Unsignalized Median Openings. Washington, D.C: Transportation Research Board, 2004.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNational Cooperative Highway Research Program, et al. Safety of U-turns at Unsignalized Median Openings. Transportation Research Board, 2004.
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