Não informado. (1962). Annals of the Geological Survey. Republic of South Africa, Department of Mines.
Chicago-referens (17:e uppl.)Não informado. Annals of the Geological Survey. Pretoria, Africa do Sul: Republic of South Africa, Department of Mines, 1962.
MLA-referens (8:e uppl.)Não informado. Annals of the Geological Survey. Republic of South Africa, Department of Mines, 1962.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.