Premsuk, Chayanisa, Pichai thongdeerert, and Patcharavadee Sriboonruang. 2022. “Adoption of the Participatory Guarantee System (PGS) Phra Nakhon Si Ayutthaya Of Organic Farmers”. Journal for Developing the Social and Community 9 (2). Bangkok, Thailand:109-22. https://so03.tci-thaijo.org/index.php/rdirmu/article/view/254512.