Não informado. Statistical and other data on minerals: Quarterly information circular. Republic of South Africa, Department of Mines.
Chicago Style (17. basım) AtıfNão informado. Statistical and Other Data on Minerals: Quarterly Information Circular. Pretoria, Africa do Sul: Republic of South Africa, Department of Mines.
MLA (8th ed.) AtıfNão informado. Statistical and Other Data on Minerals: Quarterly Information Circular. Republic of South Africa, Department of Mines.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..