พูลสวัสดิ์ พิรม. “A DEVELOPMENT ACHIEVEMENT IN FRACTION FOR GRADE 5 STUDENTS BY USING THE SKILL PRACTICE”. Journal of Industrial Education 15, no. 3 (December 30, 2016): 67–74. Accessed May 3, 2024. https://ph01.tci-thaijo.org/index.php/JIE/article/view/122639.