Chien, P. V., I. Dzabelova, C. Gupta, and Z. N. Wee. “Instructors’ Perceptions of Using Videos in Flipped Learning: A Reflective Study on Online Discussion Classes”. International Journal on Open and Distance E-Learning, vol. 7, no. 1, June 2021, https://ijodel.upou.edu.ph/index.php/ijodel/article/view/64.