Thi Lai, Tang, Nguyen Thi Hong Lien, and Nguyen Ngoc Vu. 2021. “FLIPGRID APP FOR TEACHING SPEAKING SKILLS: STUDENTS’ PERCEPTIONS AND PERFORMANCE IMPACT”. VNU Journal of Foreign Studies 37 (6):155-67. https://doi.org/10.25073/2525-2445/vnufs.4746.