Tohutoro APA (7th ed.)

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.

Tohutoru Kātū Chicago (17th ed.)

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

Tohutoro MLA (9th ed.)

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