↑ ngày 14 tháng 2 năm 1905, Ministerial ordinance No. 119, Named capture steamships Okinoshima Maru and two vessels, Minister's Secretariat, Imperial Japanese Navy
↑ ngày 1 tháng 9 năm 1905, Notice No. 120, Named capture steamships Wakamiya Maru and six vessels, Minister's Secretariat, Imperial Japanese Navy
↑ ngày 1 tháng 6 năm 1915, Notice No. 76, Transport ship Wakamiya Maru renamed warship Wakamiya, Minister's Secretariat, Imperial Japanese Navy
↑ Donko, Wilhelm M.: „Österreichs Kriegsmarine in Fernost: Alle Fahrten von Schiffen der k.(u.)k. Kriegsmarine nach Ostasien, Australien und Ozeanien von 1820 bis 1914". (epubli, Berlin, 2013). pp. 4, 156–162, 427.
↑ Layman, R.D. Before the Aircraft Carrier (Naval Institute Press, 1989) does not name the ships and gives the date as 27 November.
↑ "The Imperial Japanese Navy was a pioneer in naval aviation, having commissioned the world's first built-from-the-keel-up carrier, the Hosho." Source.
