Não informado. (1957). Bibliography and Subject Index of South African Geology. Geological Survey of South Africa.
Chicagoスタイル(17版)引用形式Não informado. Bibliography and Subject Index of South African Geology. Pretoria, Africa do Sul: Geological Survey of South Africa, 1957.
MLA(8版)引用形式Não informado. Bibliography and Subject Index of South African Geology. Geological Survey of South Africa, 1957.
警告: この引用は必ずしも正確ではありません.