International Energy Agency. (2014). Coal information: 2014 with 2013 data. International Energy Agency.
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Dyfyniad Arddull Chicago
International Energy Agency. Coal Information: 2014 with 2013 Data. Paris, France: International Energy Agency, 2014.
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Dyfyniad MLA
International Energy Agency. Coal Information: 2014 with 2013 Data. International Energy Agency, 2014.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.