全日本書芸文化院 - website of All Japan Calligraphy Art and Literature Association ((Japanese site link)
越舟書院 - Kajita Esshuu's Calligraphy Institute (Japanese site link)
Ryuurui's Calligraphy Studio - Kajita Esshuu disciple's site (also the admin for esshuu.com)
白井右鬼 - website of a seal carver, Master Shirai Yuuki
書宗院 - Shosōin calligraphy organisation (Japanese link)
天来書院 - Tenraishoin calligraphy publishing house, Tokyo (Japanese link)
越舟書院 - Kajita Esshuu's Calligraphy Institute (Japanese site link)
Ryuurui's Calligraphy Studio - Kajita Esshuu disciple's site (also the admin for esshuu.com)
白井右鬼 - website of a seal carver, Master Shirai Yuuki
書宗院 - Shosōin calligraphy organisation (Japanese link)
天来書院 - Tenraishoin calligraphy publishing house, Tokyo (Japanese link)