Não informado. (1963). Annual Research Review. Chamber of Mines of South Africa.
Chicagoスタイル(17版)引用形式Não informado. Annual Research Review. Johannesburg, Africa do Sul: Chamber of Mines of South Africa, 1963.
MLA(8版)引用形式Não informado. Annual Research Review. Chamber of Mines of South Africa, 1963.
警告: この引用は必ずしも正確ではありません.