Não informado. (1962). Annals of the Geological Survey. Republic of South Africa, Department of Mines.
Chicagoスタイル(17版)引用形式Não informado. Annals of the Geological Survey. Pretoria, Africa do Sul: Republic of South Africa, Department of Mines, 1962.
MLA(8版)引用形式Não informado. Annals of the Geological Survey. Republic of South Africa, Department of Mines, 1962.
警告: この引用は必ずしも正確ではありません.