Não informado. (2001). Petroleum world and oil. Palmer Publications.
Chicagoスタイル(17版)引用形式Não informado. Petroleum World and Oil. Los Angeles, Calif: Palmer Publications, 2001.
MLA(8版)引用形式Não informado. Petroleum World and Oil. Palmer Publications, 2001.
警告: この引用は必ずしも正確ではありません.