Geological Survey (South Africa) & Coetzee, C. B. (1976). Mineral resources of the Republic of South Africa (5th ed.). The Survey : printed by and obtainable from the Government Printer.
Citace podle Chicago (17th ed.)Geological Survey (South Africa) a C. B. Coetzee. Mineral Resources of the Republic of South Africa. 5th ed. Pretoria: The Survey : printed by and obtainable from the Government Printer, 1976.
Citace podle MLA (8th ed.)Geological Survey (South Africa) a C. B. Coetzee. Mineral Resources of the Republic of South Africa. 5th ed. The Survey : printed by and obtainable from the Government Printer, 1976.
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