On Jedai-Geki and Chambara cinema
http://www.lardbiscuit.com/jidaigeki/
Official Kamon (Mon) Registry of Japan
https://doyouknowjapan.com/symbols/
Shinto and Shintoism Guidebook. While I understand that Shintao is not a direct import of Shinto, the information might give a bit more color for shugenja players
http://www.onmarkproductions.com/html/shinto.shtml
The Samurai Archives, fora list of various samurai factions and bits of samurai culture through history
http://wiki.samurai-archives.com/index.php?title=Main_Page
Samurai Clothing through the various periods
The Shinto Encyclopedia
http://k-amc.kokugakuin.ac.jp/DM/dbTop.do?class_name=col_eos