Sayoku Seiryoku No Shokuba Shinsenjutsu: Shinto Patan to Sono Taiosaku by Rodo Keizai Senmonka Kaigi (Japan) (4818586056 9784818586055 4-8185-8605-6)
Sakurada Takeshi No Hito to Tetsugaku by Ken Otani (481858701X 9784818587014 4-8185-8701-X)
