1. James P E. All Possible Worlds (in Chinese, translated by Li X D). Beijing: Beijing Commerce Press, 1982. 1–532
2. Cowie J. Climate and Human Change, Disaster or Opportunity? New York: Parthenon Publishing, 1998. 1–368
3. Weiss H, Bradley R S. What drives societal collapse? Science, 2001, 291: 609–610
4. Hsu KJ. Sun, climate, hunger, and mass migration. Sci China Ser D-Earth Sci, 1998, 41(5): 449–472
5. Alverson K, Bradley R, Pedersen T. Environmental variability and climate change. IGBP Science Series, 2001, 3: 1–31