"Iwaki River" [Iwaki River]. Nihon Daihyakka Zensho (Nipponika) (in Japanese). Tokyo: Shogakukan. 2012. OCLC153301537. Archived from the original on 25 August 2007. Retrieved 26 June 2012.
Friday, Karl F. (1992). "The Contract Constabulary". Hired Swords: the Rise of Private Warrior Power in Early Japan. Stanford, Calif.: Stanford University Press. p. 124. ISBN978-0-8047-1978-0. LCCN91024615. OCLC24143919.
"中世・十三" [Medieval Jūsan]. Archived from the original on 31 December 2013. Retrieved 14 February 2020.
web.archive.org
"Iwaki River" [Iwaki River]. Nihon Daihyakka Zensho (Nipponika) (in Japanese). Tokyo: Shogakukan. 2012. OCLC153301537. Archived from the original on 25 August 2007. Retrieved 26 June 2012.
"中世・十三" [Medieval Jūsan]. Archived from the original on 31 December 2013. Retrieved 14 February 2020.
worldcat.org
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"Iwaki River" [Iwaki River]. Nihon Daihyakka Zensho (Nipponika) (in Japanese). Tokyo: Shogakukan. 2012. OCLC153301537. Archived from the original on 25 August 2007. Retrieved 26 June 2012.
Friday, Karl F. (1992). "The Contract Constabulary". Hired Swords: the Rise of Private Warrior Power in Early Japan. Stanford, Calif.: Stanford University Press. p. 124. ISBN978-0-8047-1978-0. LCCN91024615. OCLC24143919.