Não informado. World commodity report. Financial Times Business Information.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. World Commodity Report. London: Financial Times Business Information.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. World Commodity Report. Financial Times Business Information.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.