ผลเกิด พ, เพ็ชรร์แสงศรี ศ, ภู่พัฒน์ ผ. The Development of an Electronic Book on Mathematics Subject in Fractions and Decimal for Matayomsuksa 1 students. J. IND. EDUC. [Internet]. 2015 Aug. 31 [cited 2024 Apr. 29];14(2):252-9. Available from: https://ph01.tci-thaijo.org/index.php/JIE/article/view/122348