KULLACHAI , K. Strengthening the Sufficiency Economy Society with the Learning and Operational Process for Organic farming Certification Through Participatory Guarantee Systems (PGS) in Chiang Rai Province. VOICES AND VISIONS: Journal of Humanities and Social Sciences, [S. l.], v. 6, n. 1, p. 109–120, 2023. DOI: 10.53848/vvjournal.v6i1.2364. Disponível em: https://so14.tci-thaijo.org/index.php/VandVJournal/article/view/2364. Acesso em: 1 oct. 2026.