亀岡龍太 (December 11, 2010). "mytown.asahi.com/areanews/kochi/OSK201012100141.html" [Chōsokabe clan documents on display at Tosa Yamauchi Family Treasury and Archives beginning on the 11th] (in Japanese). Asahi.com My Town. Archived from the original on September 29, 2011. Retrieved August 22, 2011.
亀岡龍太 (December 11, 2010). "mytown.asahi.com/areanews/kochi/OSK201012100141.html" [Chōsokabe clan documents on display at Tosa Yamauchi Family Treasury and Archives beginning on the 11th] (in Japanese). Asahi.com My Town. Archived from the original on September 29, 2011. Retrieved August 22, 2011.