Óscar Arias Sánchez: Perbedaan revisi

* [http://www.project-syndicate.org/contributors/contributor_comm.php4?id=205 Óscar Arias Sánchez's Project Syndicate op/eds]
* [http://www.nacion.com/ln_ee/especiales/arias2006-2010/ La Nacion, Surat kabar Kosta Rika]
 
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