Não informado. (1946). Bulletin. National Research Council, Highway Research Board.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin. Washington: National Research Council, Highway Research Board, 1946.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin. National Research Council, Highway Research Board, 1946.
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