Independent Petroleum Association of America. (1971). Petroleum independent. Independent Petroleum Association of America].
Chicagoスタイル(17版)引用形式Independent Petroleum Association of America. Petroleum Independent. [Tulsa, Okla.: Independent Petroleum Association of America], 1971.
MLA(8版)引用形式Independent Petroleum Association of America. Petroleum Independent. Independent Petroleum Association of America], 1971.
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