Não informado. (1973). International petroleum abstracts. Institute of Petroleum.
Chicagoスタイル(17版)引用形式Não informado. International Petroleum Abstracts. London: Institute of Petroleum, 1973.
MLA(8版)引用形式Não informado. International Petroleum Abstracts. Institute of Petroleum, 1973.
警告: この引用は必ずしも正確ではありません.