อ่อนจันทร์ ส. Development Rice Database System of Ontology for Learning Process for Organic Farmer in Uttaradit Province. jHURU [internet]. 2022 Jan. 25 [cited 2026 Sep. 15];8(2):103-2. available from: https://so04.tci-thaijo.org/index.php/johuru/article/view/253987