Não informado. (1957). Bibliography and Subject Index of South African Geology. Geological Survey of South Africa.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Bibliography and Subject Index of South African Geology. Pretoria, Africa do Sul: Geological Survey of South Africa, 1957.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Bibliography and Subject Index of South African Geology. Geological Survey of South Africa, 1957.
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