Nguyễn KH, Nguyễn PT, Nguyễn VH. Ecotourism development in Tuyen Quang: case study of Lam Binh District. SJ TTU [Internet]. 2021Apr.6 [cited 2024May19];4(10):61-7. Available from: http://tckh.daihoctantrao.edu.vn/index.php/sjttu/article/view/196