Bolitho, Harold (1974): . New Haven: Yale University Press. ISBN 0-300-01655-7/ISBN 978-0-300-01655-0; OCLC 185685588 Brown, Sidney DeVere (1994): . Evans, David; Mark Peattie (1997): . Annapolis, Maryland: Naval Institute Press. ISBN 0-87021-192-7. Gordon, Andrew (2003): . New York: Oxford. ISBN 0-19-511060-9. Hagiwara, Kōichi (2004): 図説 西郷隆盛と大久保利通 («Det illustrerte livet til Saigō Takamori og Okubo Toshimichi»). Jansen, Marius B. (2002): . Harvard.ISBN 0-674-00334-9/ISBN 978-0-674-00334-7; OCLC 44090600 Keene, Donald (2005): . Columbia.ISBN 0-231-12340-X; ISBN 978-0-231-12340-2; OCLC 46731178 Satow, Ernest ([1921] 1968): . Tokyo: Oxford.