Otani, Tomio (1967), Goodbody, J. (ed.), "Kendo"(PDF), The Japanese Fighting Arts (abridged version), Arlington Books, pp. 35–64, archived from the original(PDF) on 2007-09-29
Otani, Tomio (1967), Goodbody, J. (ed.), "Kendo"(PDF), The Japanese Fighting Arts (abridged version), Arlington Books, pp. 35–64, archived from the original(PDF) on 2007-09-29