Nguyễn Thị, Hòa, and Nhung Vi Thị. “Exploiting the Potential for Eco-Tourism Development in Luc Ngan District, Bac Giang Province”. SCIENTIFIC JOURNAL OF TAN TRAO UNIVERSITY 6, no. 16 (April 7, 2021): 72–79. Accessed May 6, 2024. https://tckh.daihoctantrao.edu.vn/index.php/sjttu/article/view/326.