APA(7版)引用形式

Não informado. (1959). Copper abstracts. Copper Development Association.

Chicagoスタイル(17版)引用形式

Não informado. Copper Abstracts. London: Copper Development Association, 1959.

MLA(8版)引用形式

Não informado. Copper Abstracts. Copper Development Association, 1959.

警告: この引用は必ずしも正確ではありません.