Tram, Nguyen Thi Minh. “Appropriate Classroom Activities for Effective Teaching of Business English Speaking Skill Necessary for Vietnamese Businessmen”. VNU Journal of Foreign Studies 26, no. 4 (December 15, 2010). Accessed April 4, 2025. https://jfs.ulis.vnu.edu.vn/index.php/fs/article/view/2575.