Tạ Văn Thông, and Phạm Văn Tình. “Conservating Ethnic Minoritie Languages in Vietnam before the Danger of Being Lost”. SCIENTIFIC JOURNAL OF TAN TRAO UNIVERSITY 3, no. 5 (December 8, 2020): 27–32. Accessed May 2, 2024. https://tckh.daihoctantrao.edu.vn/index.php/sjttu/article/view/134.