Não informado. (2002). Industrial Commodity Statistics Yearbook. United Nations.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Industrial Commodity Statistics Yearbook. New York: United Nations, 2002.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Industrial Commodity Statistics Yearbook. United Nations, 2002.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.