1. 1) Ministry of the Environment, Ministry of Economy, Trade and Industry, Greenhouse Gas Emissions Estimation methods April 2014
2. 2) Ministry of the Environment, About the nature of carbon offset in japan, Guideline, February 7, 2008
3. 3) Ministry of the Economy, Trade and Industry, Ministry of the Environment, Ministry of Agriculture, Forestry and Fisheries, Domestic credit system, Domestic emission reduction certification system, October 2008
4. 4) Ministry of the Economy, Trade and Industry, Industrial Science and Technology Policy and Environment Bureau, Environmental Economics Office, For domestic credit system, December 2009
5. 5) Ministry of the Environment, Guidelines of reliability built in accordance with the approach of the carbon offset by-contained between the specified person