Bunkatsu Tochi: Hirei Daihyosei Donyugo No Nihon Seiji by Rei Shiratori, Yasuharu Okino, Nobuo Sakagami (4755610133 9784755610134 4-7556-1013-3)
Bunka Jinruigaku by Hiroshi Ogawa (4755610141 9784755610141 4-7556-1014-1)
