1. Masaru Nishiyama . “Sengoku daimyō Kitabatakeshi no kenryoku kōzō” Shirin 62 (March 1979).
2. hensanjo Tōkyō daigaku shiryō , ed. Dai Nihon kokiroku kennaiki, vol. 1. Tokyo: Iwanami shoten, 1963.
3. Susumu Ishii . Nihon chūsei kokkashi no kenkyū. Tokyo: Iwanami shoten, 1970.
4. Hisashi Fujiki . Sengoku shakai shiron. Tokyo: Tōkyō daigaku shuppankai, 1974.
5. Hiroshi Matsuyama . Shugo jōkamachi no kenkyū. Kyoto: Daigakudō shoten, 1982.