1. Huan Qing Zhi: The international comparison of the environmental politics [M]. Shandong University Press (2007), p.131.
2. Li Bo Yan: Green politics - the traditional concept of environmental problems on the challenges [M]. China International Radio Press (2001), p.52.
3. Wang Pu Qu, etc.: Political Science foundation [M]. Peking University Press (2006), p.180.
4. PanYue: Protecting the environment is promoting social equity [M]. China Newsweek (2004), p.11.
5. Jia Gong Hui, He Xiao min, etc.: Environment-friendly government [M]. China Environmental Science Press (2006), p.23.