Não informado. (2020). Report of the Geological Survey of Natal and Zululand. P. Davis & Sons, Printers.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Report of the Geological Survey of Natal and Zululand. Pietermaritzburg, Africa do Sul: P. Davis & Sons, Printers, 2020.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Report of the Geological Survey of Natal and Zululand. P. Davis & Sons, Printers, 2020.
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