1. State Council Information Office of China, Ecological Improvement and Environmental Protection in Tibet,2003
2. Tibet Statistical Yearbook-2008;Tibet Statistical Yearbook-2008,2008
3. Building a “Green” railway in China;Peng;Science,2007
4. Tibet Statistical Yearbook-2007;Tibet Statistical Yearbook-2007,2007
5. Energy condition and development in Tibet;National Energy Bureau of China,2006