Haruo, Noma, 		Thanh, Trần, AND 		Hoa, Trần.
" 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" <em>VNU Journal of Science: Earth and Environmental Sciences</em> [Online], Volume 29 Number 1 (15 March 2013)