Não informado. Statistical and other data on minerals: Quarterly information circular. Republic of South Africa, Department of Mines.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Statistical and Other Data on Minerals: Quarterly Information Circular. Pretoria, Africa do Sul: Republic of South Africa, Department of Mines.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Statistical and Other Data on Minerals: Quarterly Information Circular. Republic of South Africa, Department of Mines.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.