(1940). Highway Research Board. Division of Engineering and Industrial Research, National Research Council.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHighway Research Board. Washington, D.C: Division of Engineering and Industrial Research, National Research Council, 1940.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHighway Research Board. Division of Engineering and Industrial Research, National Research Council, 1940.
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