Não informado. Statistical and other data on minerals: Quarterly information circular. Republic of South Africa, Department of Mines.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Statistical and Other Data on Minerals: Quarterly Information Circular. Pretoria, Africa do Sul: Republic of South Africa, Department of Mines.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Statistical and Other Data on Minerals: Quarterly Information Circular. Republic of South Africa, Department of Mines.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.