Tài liệu tham khảo WikiPedia: Michitsuna no Haha http://www.sacred-texts.com/shi/hvj/index.htm http://chimviet.free.fr/vannhat/namtran/Wakatramnh... http://chimviet.free.fr/vannhat/namtran/Wakatramnh... https://web.archive.org/web/20161128204230/http://... https://web.archive.org/web/20161222195229/http://...
