@book{137153,
	author = {Organization of the Petroleum Exporting Countries, OPEC},
	title = {Sitio Web Institucional},
	publisher = {Organization of the Petroleum Exporting Countries, OPEC},
	year = {2002},
	address = {Vienna, Austria},
	note = {Sitio Web visitado en julio de 2002. ; Navegadores de Internet},
	url = {http://www.opec.org/}
}