ศรีวิเนตรส. (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), pp. 41-52. Available at: https://www.tci-thaijo.org/index.php/reru/article/view/187016 (Accessed: 13November2019).