http://www.arcprospect.org/index.php?option=com_content&view=article&id=2088%3Ashoei-yoh-hamura&catid=101%3Apeople-articles&Itemid=11&lang=en

http://www.arcprospect.org/index.php?option=com_content&view=article&id=2088%3Ashoei-yoh-hamura&catid=101%3Apeople-articles&Itemid=11&lang=en

http://www.toto.co.jp/gallerma/hist/en/biogra/yohsho.htm