APA aipamena

Organization of Petroleum Exporting Countries. OPEC bulletin. Organization of the Petroleum Exporting Countries.

Chicago Style aipamena

Organization of Petroleum Exporting Countries. OPEC Bulletin. Vienna: Organization of the Petroleum Exporting Countries.

MLA aipamena

Organization of Petroleum Exporting Countries. OPEC Bulletin. Organization of the Petroleum Exporting Countries.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.