Satsin, T., and S. Wongwiseskul. “Lessons Learn from Online Teaching: Challenges for Teacher under COVID - 19 Situations”. Journal of The Royal Thai Army Nurses, vol. 22, no. 1, Apr. 2021, pp. 1-9, https://he01.tci-thaijo.org/index.php/JRTAN/article/view/242773.