APA (7th ed.) Zitazioa
Organisation for Economic Co-operation and Development & ProQuest (Firm). (2009). Coal information 2009: With 2008 data. OECD/IEA.
Chicago Style (17th ed.) Zitazioa
Organisation for Economic Co-operation and Development eta ProQuest (Firm). Coal Information 2009: With 2008 Data. Paris, France: OECD/IEA, 2009.
MLA (9th ed.) Zitazioa
Organisation for Economic Co-operation and Development eta ProQuest (Firm). Coal Information 2009: With 2008 Data. OECD/IEA, 2009.
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