Ton, Han Nu Ngoc, and Quynh Hai Xuan Do. “The Effectiveness of Virtual Events During Covid-19 Pandemics”. Advances in Social Sciences Research Journal 9, no. 7 (July 25, 2022): 278–295. Accessed April 20, 2024. https://journals.scholarpublishing.org/index.php/ASSRJ/article/view/12655.