Nguyễn Ngọc Lan. “Difficulties Encountered in the Toeic Listening Test by Trade Union university’s Students”. Tạp chí Nghiên cứu Khoa học Công đoàn, no. 27 (October 26, 2022): 79. Accessed May 26, 2026. https://vjol.info.vn/DHCD/article/view/72738.