Nguyễn, Khải Hoàn, Phương Thảo Nguyễn, and Văn Hiền Nguyễn. 2021. “Ecotourism Development in Tuyen Quang: Case Study of Lam Binh District”. SCIENTIFIC JOURNAL OF TAN TRAO UNIVERSITY 4 (10):61-67. https://doi.org/10.51453/2354-1431/2018/196.