กลัดล้อม ร., สุขมาตย์ อ., and ภู่พัฒน์ ผ. “DEVELOPMENT OF 4 MAT ACTIVITIES PACKAGE ON PAST TENSE FOR GRADE 10 STUDENTS AT PROTPITTAYAPAYAT SCHOOL”. Journal of Industrial Education, vol. 15, no. 1, Apr. 2016, pp. 37-43, https://ph01.tci-thaijo.org/index.php/JIE/article/view/122254.