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・"If Japan can be an Energy Power or not",Kitazawa Hiroiti,Kyodo Printing Corporation,June.29.2012

・"Biomass energy・Business",Ozawa Syouji・Urakami Kenji,Seibundo Printing Corporation,october.2013

・"Risk and Governance of renewable energy",Maruyama Kouji・Nisikido Makoto・Motosu Memi,Minervashobo,October.22.2015

・"Potential and limit of Natural Energy-Ability and Real Solution-"

　Isikawa Kenji,Ohmsha,July.24.2010

・"100 years of Japan with the numbers", revised 6th Edition Japan Census using long-term statistics Edition, March.2013

・"Japanese History A" Akimasa Miyake, Tokyo-Shoseki, 2013

・"New chart of geography GEO",Daiitigakusyusya,January.2015

・"Revitalization of local area by recyclable energy-case Oita prefecture-"

　Natinal Diet Library Kondo Kaori dl.ndl.go.jp　reference date:August.25.2016

・"Using geothrmal heat of Oita prefecture",eco-community Japan secretariat　ecocommunity.jpn.com　reference date:August.25.2016

・"Local Energy Generation and Consumption Geothermal power generation",New Energy and Industrial Technology Development Organization 　www.nedo.go.jp　reference date:August.25.2016

・Smart Japan “Energy Archipelago 2016 (8) Ibaraki”,Ishida Masaya　reference date:August.25.2016 http://www.itmedia.co.jp/smartjapan/articles/1606/14/news016.html

・Smart Japan “Nature Energy”,Ishida Masaya reference date:December.28.2016 http://www.itmedia.co.jp/smartjapan/articles/1607/11/news040.html

・Institute for Sustainable Energy Publics “Renewables 2015 Japan Status Report” 　2016年8月25日　www.isep.or.jp　

・RecoD Energy press "Good point and issue in the future of recyclable energy"　reference date:August.26.2016 http://www.recod.jp/epress/recycle-merit-issue/

・NEDO white paper on the technology of recyclable energy reference date:December.18.2016 http://www.nedo.go.jp/content/100544819.pdf

・General Foudation corporation, New Energy Foundation　reference date:December.18.2016 https://www.asiabiomass.jp/topics/1506_05.html

・Dresden Imformation File　reference date:December.18.2016　 http://www.de-info.net/kiso/atomterm00.html#AGEB

・Eco Town in the World, Freiburg　reference date:December.18.2016 https://www2.panasonic.biz/es/solution/fujisawa/ecotown/freiburg.html

・Green Community News Letter　reference date:December.18.2016　 http://www.kkc.co.jp/service/env_energy/pdf/gcnl_vol_05.pdf#search=%27%E3%83%95%E3%83%A9%E3%82%A4%E3%83%96%E3%83%AB%E3%82%AF+%E3%82%A8%E3%83%8D%E3%83%AB%E3%82%AE%E3%83%BC%E6%94%BF%E7%AD%96%27

・Environmental Reports of Freiburg by Nariko Maeda　reference date:December.18.2016 http://www.eco-freiburg.com/ecology_solution.html

・the Network Aiming for a Renewable Nergy Society　reference date:December.18.2016 http://www.geocities.jp/naturalenergysociety/eiganaiyou.html