Wongprakhon , Wuttipat, and Phongthanat Sae-Joo. 2021. “The Development of Multimedia Instruction with Problem based Learning to Encourage C Programming Skill for Grade 10 Students”. Journal of Modern Learning Development 6 (6):89-103. https://so06.tci-thaijo.org/index.php/jomld/article/view/250415.