�     http://www.samuraisword.com/

�     http://en.wikipedia.org/wiki/Katana

�     http://home.earthlink.net/~steinrl/glossry.htm

�     http://www.swordsoftheeast.com/

�     http://www.mantisswords.com/

�     http://www-tc.pbs.org/wgbh/nova/teachers/activities/pdf/3412_samurai.pdf

� http://ezinearticles.com/?Samurai-Swords