Não informado. (2004). Highway research circular. National Research Council, Highway Research Board.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Highway Research Circular. Washington: National Research Council, Highway Research Board, 2004.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Highway Research Circular. National Research Council, Highway Research Board, 2004.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.