Le Monde avec AFP, « L'ETA met fin à l'"impôt révolutionnaire" », Le Monde, (lire en ligne).
liberation.fr
Patricia Tourancheau, « Lizarazu: la menace ETA prise au sérieux. », Libération, (lire en ligne).
nato.int
Counterterrorism: An Example of Co-operation, Juan Miguel Lian Macias, Ministry of Defence of Spain, 2002-2-22: "ETA is funded mainly from one source: the money it collects through extortion of small and medium businessmen, charging them the so-called "revolutionary tax". At present the amounts required are between 35,000 and 400,000 euros. The annual budget the terrorist organisation needs for the maintenance of its structures is estimated at around 10 million euros. Beyond the Spanish borders, ETA seeks links with similar groups and causes. Hence, it intends to gain the support of ideologically akin groups. It has or has had contacts with the Breton Revolutionary Army, with Corsican and Irish terrorist groups, with revolutionary groups from Latin America, etc."
