Nguyễn Ngọc Lan (2022) “Difficulties encountered in the toeic listening test by trade union university’s students”, Tạp chí Nghiên cứu Khoa học Công đoàn, (27), p. 79. Available at: https://vjol.info.vn/DHCD/article/view/72738 (Accessed: 26May2026).