Quorum requirements for a referendum to be valid

Constitution 19/08/2003, last amendment 2011 http://democratie.francophonie.org/IMG/pdf/Gabon.pdf

Electoral code 2005 http://fr.scribd.com/doc/17768418/Loi-electorale-du-Gabon

Amendment to electoral law Ordonnance n?009/PR/2011 du 11 ao?t 2011 modifiant, compl?tant et abrogeant certaines dispositions de la loi n?7/96 du 12 mars 1996 portant dispositions communes ? toutes les ?lections politiques http://aceproject.org/ero-en/regions/africa/GA/gabon-electoral-law-2011/view