APA (7e ed.) Bronvermelding
International Energy Agency & ProQuest (Firm). (2011). Natural gas information: 2011 with 2010 data. International Energy Agency.
Chicago (17e ed.) Bronvermelding
International Energy Agency en ProQuest (Firm). Natural Gas Information: 2011 with 2010 Data. Paris: International Energy Agency, 2011.
MLA (9e ed.) Bronvermelding
International Energy Agency en ProQuest (Firm). Natural Gas Information: 2011 with 2010 Data. International Energy Agency, 2011.
Let op: Deze citaties zijn niet altijd 100% accuraat.