organization of the petroleum exporting countries. (2017). annual report 2017. grasl druck & neue medien gmbh.
Čikaški stil citiranja (17. izdanje)organization of the petroleum exporting countries. Annual Report 2017. austria: grasl druck & neue medien gmbh, 2017.
MLA način citiranja (9. izdanje)organization of the petroleum exporting countries. Annual Report 2017. grasl druck & neue medien gmbh, 2017.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.