Cita APA (7th ed.)
(2010). Natural gas information: 2010 with 2009 data. International Energy Agency.
Cita Chicago (17th ed.)
Natural Gas Information: 2010 with 2009 Data. France: International Energy Agency, 2010.
Cita MLA (9th ed.)
Natural Gas Information: 2010 with 2009 Data. International Energy Agency, 2010.
Atenció: Aquestes cites poden no estar 100% correctes.