International Energy Agency & ProQuest (Firm). (2011). Natural gas information: 2011 with 2010 data. International Energy Agency.
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Dyfyniad Arddull Chicago
International Energy Agency and ProQuest (Firm). Natural Gas Information: 2011 with 2010 Data. Paris: International Energy Agency, 2011.
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Dyfyniad MLA
International Energy Agency and ProQuest (Firm). Natural Gas Information: 2011 with 2010 Data. International Energy Agency, 2011.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.