APA (7e ed.) Bronvermelding

Organization of Petroleum Exporting Countries. World oil outlook 2011.

Chicago (17e ed.) Bronvermelding

Organization of Petroleum Exporting Countries. World Oil Outlook 2011.

MLA (9e ed.) Bronvermelding

Organization of Petroleum Exporting Countries. World Oil Outlook 2011.

Let op: Deze citaties zijn niet altijd 100% accuraat.