Cita APA (7th ed.)
International Energy Agency. (2012). Coal information: 2012 with 2011 data. OECD/IEA.
Cita Chicago (17th ed.)
International Energy Agency. Coal Information: 2012 with 2011 Data. France: OECD/IEA, 2012.
Cita MLA (9th ed.)
International Energy Agency. Coal Information: 2012 with 2011 Data. OECD/IEA, 2012.
Atenció: Aquestes cites poden no estar 100% correctes.