Não informado. (1963). Bulletin of statistics on world trade in engineering products. United Nations, Economic Commission for Europe.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of Statistics on World Trade in Engineering Products. New York: United Nations, Economic Commission for Europe, 1963.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of Statistics on World Trade in Engineering Products. United Nations, Economic Commission for Europe, 1963.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.