- [3][permanent dead link] (****anese)
Seiya Kumazaki,"「素振りの正体」" 手塚一志の上達屋BASEBALL
DOJYO [4] (****anese)
Archived January 29, 2008, at the
Wayback Machine...
-
Germany (in English)
Official site of Yagyū-Shingan-ryū-heijyutu Toyama-
dojyo(Sendai-line)
Official site of Yagyū-Shingan-ryū
Heiho Ryushin-Kai (Sendai-line)(in...