Na Nan, Tansiphorn, Pimsiri Tiyayon, Thitipat Weeplian, Phanomsak Tomjai, Phannida Baiya, Supanida Thongpan, Apichaya Feepakpro, Wirakan Nortao, Thofan Kakham, Apinan Phanphuet, Ampika Chuamor, and Supin Sangsuk. 2023. “Development of a Fresh Cacao Grading System Using Participatory Mechanisms in Nan Province”. Area Based Development Research Journal 15 (3):182-97. https://so01.tci-thaijo.org/index.php/abcjournal/article/view/266670.