1. The Facts about shigella infections and bacillary dysentery,;Association of Medical Microbiologists
2. Disease Control and Public Health,;China's Health Statistical Yearbook 2009,2009
3. Main Population Data in 2008, China,;China Population and Development Research Center
4. Birth rate, Death Rate and Natural Growth Rate of Population,;China Statistical Yearbook 2008,2008
5. Population and Its Composition,;China Statistical Yearbook 2008,2008