Nguyen, Minh Xuan. “Flipping an IELTS Writing Class: Vietnamese learners’ Perception”. HO CHI MINH CITY OPEN UNIVERSITY JOURNAL OF SCIENCE - SOCIAL SCIENCES, vol. 15, no. 4, Oct. 2024, pp. 97-111, doi:10.46223/HCMCOUJS.soci.en.15.4.2293.2025.