APA (7th ed.) Zitazioa

Organization of the petroleum exporting countries, MacNeill, M., Plakolm, E., Golpashin, D., & Hammer, W. (2013). Organization of the petroleum exporting countries: Annual report 2012. Organization of the petroleum exporting countries.

Chicago Style (17th ed.) Zitazioa

Organization of the petroleum exporting countries, Maureen MacNeill, Elfi Plakolm, Diana Golpashin, eta Wolfgang Hammer. Organization of the Petroleum Exporting Countries: Annual Report 2012. Vienna: Organization of the petroleum exporting countries, 2013.

MLA (9th ed.) Zitazioa

Organization of the petroleum exporting countries, et al. Organization of the Petroleum Exporting Countries: Annual Report 2012. Organization of the petroleum exporting countries, 2013.

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