Leung, Chi Hong, and Winslet Ting Yan Chan. “Lack of Teachers’ Facial Expression in the COVID-19 Pandemic: Problems and Ways to Solutions”. Journal of Asian Scientific Research 12, no. 2 (May 24, 2022): 62–69. Accessed November 22, 2024. https://archive.aessweb.com/index.php/5003/article/view/4492.