https://books.google.co.jp/books?id=QC_jUvZduw8C&pg=PA81&lpg=PA81&dq=甲野善紀+根性&source=bl&ots=L-V-uc0tey&sig=W3UOD7qVXiBjrz7-MV_v5KdCTxg&hl=ja&sa=X&ved=0ahUKEwiSwdHX0unVAhWKfrwKHYjyCJoQ6AEILTAD#v=onepage&q=%E7%94%B2%E9%87%8E%E5%96%84%E7%

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