Takeda Shingen (武田 信玄, December 1, 1521 – May 13, 1573) was daimyo of Kai Province during the Sengoku period of Japan. Known as "the Tiger of Kai", he...

Osprey Publishing. 平山優 (2008). "秋山虎繁". 新編 武田信玄のすべて. 新人物往来社: 296. 丸島和洋 (2015). "秋山虎繁」「秋山昌詮」「秋山源三郎」「秋山式部右衛門尉". 武田氏家臣団人名辞典. 東京堂出版: 224. "Legendary Takeda's 24...

Nagano Inoue, Yasushi. (2006). The Samurai banner of Furin Kazan, p. 7. "武田家臣団人事ファイル 山本晴幸(山本勘助)". Archived from the original on 2007-03-22. Retrieved 2007-05-05...