1. Global Air Pollution Problems;Jain,2003
2. Environmental Science;Chiras,2006
3. Climate Change 2007: Mitigation of Climate Change,2007
4. http://unfccc.int/resource/docs/convkp/kpeng.pdf
5. http://www.oecd.org/document/40/0,3746,en_2649_34283_39011377_1_1_1_1,00.html