ศรีวิเนตร ส. (2019). The Development of an Instructional Model for Chemistry Focus on Self-directed Learning to Promote Critical Thinking and Learning Achievement for Mathayom Suksa 4 Students. Journal of Roi Et Rajabhat University, 13(2), 41–52. Retrieved from https://so03.tci-thaijo.org/index.php/reru/article/view/187016