Tonkunya A, Yuenyong C, Ma-uy S. Enhancing Grade 8 Students’ Conception and Representation about Chemical Isolation. JTPLC [internet]. 2022 Jul. 1 [cited 2026 Sep. 2];2(1):1-14. available from: https://so05.tci-thaijo.org/index.php/JTPLC/article/view/260225