Haruo, Noma, Trần Đức Thanh, & Trần Thị Mai Hoa. " Some Difficulties and Suggestions for Sustainable Marine Eco-tourism in Vietnam and Japan: Case Studies of Vân Đồn District, Quảng Ninh Province and Akkeshi Town, Hokkaido." VNU Journal of Science: Earth and Environmental Sciences [Online], 29.1 (2013): n. pag. Web. 22 Nov. 2024