Haro-Pérez, Isabel Maria; Cuéllar-Padilla, Mamen and Laytte-García, María José (2021) Participatory Guarantee Systems Vs Official Certification System. When People Want To Take Part Of It... Paper at: Organic World Congress 2021, Science Forum: 6th ISOFAR Conference co-organised with INRA, FiBL, Agroecology Europe, TP Organics and ITAB, Rennes, France, 8 - 10 September, 2021. [Completed]