Coba jelasin Catatan dari Mitsubishi Heavy Industries dong

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Kizu, Shigetoshi. (1984).  A 100 Years' History of the Ships of Nippon Yusen Kaisha. Tokyo: NYK. ;

Ponsonby-Fane, Richard Arthur Brabazon. (1935).  The Nomenclature of the N.Y.K. Fleet. Tokyo: NYK.

Wray, William D. (1984). Mitsubishi and the N.Y.K., 1870–1914: Business Strategy in the Japanese Shipping Industry. Cambridge: Council on East Asian Studies, Harvard University, Harvard University Press. ;