Não informado. (1961). Petroleum Intelligence Weekly. Petroleum Intellegence Weekly.
Chicagoスタイル(17版)引用形式Não informado. Petroleum Intelligence Weekly. New York: Petroleum Intellegence Weekly, 1961.
MLA(8版)引用形式Não informado. Petroleum Intelligence Weekly. Petroleum Intellegence Weekly, 1961.
警告: この引用は必ずしも正確ではありません.