Não informado. (2001). Special Publication. Geological Society of South Africa.
Chicagoスタイル(17版)引用形式Não informado. Special Publication. Johannesburg, Africa do Sul: Geological Society of South Africa, 2001.
MLA(8版)引用形式Não informado. Special Publication. Geological Society of South Africa, 2001.
警告: この引用は必ずしも正確ではありません.