Hai, Nguyen, Nguyen Thi Quy Hoi, & Tran Thi Mai Hoa.
" Territorial organization for ecotourism development in Hoang Lien National Park, Sapa District, Lao Cai Province." <em>VNU Journal of Science: Earth and Environmental Sciences</em> [Online], 24.1 (2008): n. pag. Web. 22 Nov. 2024