Thi Bich Thuy, L. “PARTS OF SPEECH IN GERMAN AND RELATED MISTAKES MADE BY STUDENTS OF GERMAN AT VNU UNIVERSITY OF LANGUAGES AND INTERNATIONAL STUDIES”. VNU Journal of Foreign Studies, vol. 37, no. 5, Oct. 2021, pp. 89-103, https://jfs.ulis.vnu.edu.vn/index.php/fs/article/view/4915.