Toens, D. (1966). Precambrian dolomite and limestone of the Northern Cape Province. Govt. Printer.
Lua i Stíl Chicago (17ú heag.)Toens, Dennis. Precambrian Dolomite and Limestone of the Northern Cape Province. Pretoria: Govt. Printer, 1966.
Lua MLA (8ú heag.)Toens, Dennis. Precambrian Dolomite and Limestone of the Northern Cape Province. Govt. Printer, 1966.
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