1. The Economics of Climate Change: The Stern Review;Stern,2007
2. Markets for Clean Air: The US Acid Rain Program;Ellerman,2000
3. See news.bbc.co.uk/1/hi/world/europe/6732787.stm.
4. Emission Trading: Environmental Policy’s New Approach,2000
5. Voluntary Carbon Markets: An International Business Guide to What They Are and How They Work,2009