Não informado. Civil engineering. U.S. Department of Commerce, National Technical Information Service.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Civil Engineering. Springfield, Va: U.S. Department of Commerce, National Technical Information Service.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Civil Engineering. U.S. Department of Commerce, National Technical Information Service.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.