Dyfyniad APA

Organisation for Economic Co-operation and Development & ProQuest (Firm). (2009). Coal information 2009: With 2008 data. OECD/IEA.

Dyfyniad Arddull Chicago

Organisation for Economic Co-operation and Development and ProQuest (Firm). Coal Information 2009: With 2008 Data. Paris, France: OECD/IEA, 2009.

Dyfyniad MLA

Organisation for Economic Co-operation and Development and ProQuest (Firm). Coal Information 2009: With 2008 Data. OECD/IEA, 2009.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.