1. Agency for Natural Resources and Energy (ANRE), 2010. FY 2010 Annual Energy Report (in Japanese). 〈http://www.enecho.meti.go.jp/topics/hakusho/2010/index.htm〉 (accessed 11.11.13)
2. ANRE, 2011. Energy Conservation Policies of Japan. 〈http://www.enecho.meti.go.jp/policy/saveenergy/save01/genjo_English.pdf〉 (accessed 11.11.13)
3. ANRE, 2012. FY 2012 Annual Energy Report (in Japanese). 〈http://www.enecho.meti.go.jp/topics/hakusho/2012/index.htm〉 (accessed 11.11.13).
4. Market failures and barriers as a basis for clean energy policies;Brown;Energy Policy,2001
5. Barriers within firms to energy efficient investments;DeCanio;Energy Policy,1993