Pham, T. N., and D. T. Duong. “USING KAHOOT! IN VOCABULARY LEARNING: EVIDENCE FROM A VIETNAMESE HIGHER EDUCATION CONTEXT”. VNU Journal of Foreign Studies, vol. 38, no. 3, June 2022, pp. 138-52, https://jfs.ulis.vnu.edu.vn/index.php/fs/article/view/4853.