International Energy Agency. (2015). Oil information 2015. International Energy Agency.
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Dyfyniad Arddull Chicago
International Energy Agency. Oil Information 2015. Paris, [France]: International Energy Agency, 2015.
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Dyfyniad MLA
International Energy Agency. Oil Information 2015. International Energy Agency, 2015.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.