MORI, Takayuki. “TUGBOAT BUSINESS IN JAPAN AND ASIA The Present Situation and Issues of Tugboat Business”. Thai Journal of East Asian Studies 16, no. 1 (March 30, 2011): 1–13. Accessed May 15, 2024. https://so02.tci-thaijo.org/index.php/easttu/article/view/51151.