Não informado. (1977). Transportation Engineering. Institute of Transportation Engineers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Transportation Engineering. Arlington, Va: Institute of Transportation Engineers, 1977.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Transportation Engineering. Institute of Transportation Engineers, 1977.
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