Annual report /
Organization of the Petroleum Exporting Countries.

APA Citation

Organization of Petroleum Exporting Countries. Annual report. Vienna: [Public Relations Dept., Organization of the Petroleum Exporting Countries].

MLA Citation

Organization of Petroleum Exporting Countries. Annual Report. Vienna: [Public Relations Dept., Organization of the Petroleum Exporting Countries],

Warning: These citations may not always be complete (especially for serials).