Trumbull White (1895). The War in the East. J. H. Moore and Company. pp. 597–606. Retrieved 9 August 2011.
One or more of the preceding sentences incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1922). "Iwao, Ōyama". Encyclopædia Britannica. Vol. 31 (12th ed.). London & New York: The Encyclopædia Britannica Company. p. 1226.
"大山巌関係文書(寄託) | 憲政資料室の所蔵資料 | 国立国会図書館" [Documents related to Iwao Oyama (Deposited)]. The National Archives of Japan, National Diet Library. Retrieved 25 March 2020.