Não informado. (2020). Report of the Geological Survey of Natal and Zululand. P. Davis & Sons, Printers.
Chicago (17e ed.) BronvermeldingNão informado. Report of the Geological Survey of Natal and Zululand. Pietermaritzburg, Africa do Sul: P. Davis & Sons, Printers, 2020.
MLA (8e ed.) BronvermeldingNão informado. Report of the Geological Survey of Natal and Zululand. P. Davis & Sons, Printers, 2020.
Let op: Deze citaties zijn niet altijd 100% accuraat.