Đỗ Tuyết Ngân. “The Potentials for Developing Trekking Tour in Xuan Son National Park, Phu Tho Province”. SCIENTIFIC JOURNAL OF TAN TRAO UNIVERSITY 5, no. 12 (December 8, 2020): 98–102. Accessed November 27, 2024. https://tckh.daihoctantrao.edu.vn/index.php/sjttu/article/view/249.