National Research Council (U.S.). Highway Research Board. (1956). Proceedings of the twenty-fifth annual meeting - Highway Research Board. National Academy of Sciences-National Research Council.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNational Research Council (U.S.). Highway Research Board. Proceedings of the Twenty-fifth Annual Meeting - Highway Research Board. Washington: National Academy of Sciences-National Research Council, 1956.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNational Research Council (U.S.). Highway Research Board. Proceedings of the Twenty-fifth Annual Meeting - Highway Research Board. National Academy of Sciences-National Research Council, 1956.
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