Cita APA

(1991). Viewpoint: An OPEC series. [Viena, Austria]: Organization of the Petroleum Exporting Countries.

Citación estilo Chicago

Viewpoint: An OPEC Series. [Viena, Austria]: Organization of the Petroleum Exporting Countries, 1991.

Cita MLA

Viewpoint: An OPEC Series. [Viena, Austria]: Organization of the Petroleum Exporting Countries, 1991.

Precaución: Estas citas no son 100% exactas.