Cita APA (7th ed.)

(1979). OPEC national oil company profiles. Secretariat, Organization of the Petroleum Exporting Countries.

Cita Chicago (17th ed.)

OPEC National Oil Company Profiles. Vienna: Secretariat, Organization of the Petroleum Exporting Countries, 1979.

Cita MLA (8th ed.)

OPEC National Oil Company Profiles. Secretariat, Organization of the Petroleum Exporting Countries, 1979.