References
- Komatsu Hiroshi (1997). Tanaka Shozo: Niju isseiki e no shisojin (Tanaka Shozo: Thinker to the Twenty-First Century). Tokyo: Chikuma shobo.
- Shoji Kichiro , and Sugai Masuro (2014). Tsushi Ashio kodoku jiken 1877–1984 (An Overview History of the Ashio Copper Mine Pollution Incident). Tokyo: Seori shobo.