1. American Rivers 2017 https://www.americanrivers.org/threats-solutions/restoring-damaged-rivers
2. American Rivers, Friends of the Earth and Trout Unlimited 1999
3. American Rivers and NPS (Rivers, Trails, and Conservation Assistance Program, National Park Service) 1996 River Renewal: Restoring Rivers Through Hydropower Dam Relicensing
4. Asahi Shimbun 1961 Remove the Yasuaoka Dam
5. Asahi Shimbun 1986 The Tokyo Electric Power Co. have to pay 0.8 billion yen for the typhoon receivers in Nagano