Não informado. (1962). Annals of the Geological Survey. Republic of South Africa, Department of Mines.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Annals of the Geological Survey. Pretoria, Africa do Sul: Republic of South Africa, Department of Mines, 1962.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Annals of the Geological Survey. Republic of South Africa, Department of Mines, 1962.
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