National Research Council (U.S.). Highway Research Board. (1951). Highways with a narrow median: Presented at the Thirtieth Annual Meeting, 1951. Highway Research Board.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNational Research Council (U.S.). Highway Research Board. Highways with a Narrow Median: Presented at the Thirtieth Annual Meeting, 1951. Washington, D.C: Highway Research Board, 1951.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNational Research Council (U.S.). Highway Research Board. Highways with a Narrow Median: Presented at the Thirtieth Annual Meeting, 1951. Highway Research Board, 1951.
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