เกษทองมาร., ศรีจำนงค์จ. ศ. and อาจแก้วจ. (2019) “Needs assessment on Self-Development for STEM educational learning management of primary school teachers under Sakonnakhon primary educational service area office 2”, Journal of Humanities and Social Sciences University of Phayao, 6(2), pp. 45 - 62. Available at: https://so03.tci-thaijo.org/index.php/Humanties-up/article/view/196541 (Accessed: 27May2020).