1. Bielenstein, Hans. 1947. The census of China during the period 2-742 A.D. Vol. 19, 125–163. Stockholm: Museum of Far Eastern Antiquities.
2. Buckley, Chris. 2015. China ends one-child policy, allowing families two children. New York Times, October 29. https://www.nytimes.com/2015/10/30/world/asia/china-end-one-child-policy.html.
3. Cai, Yanjun, Xiaoke Qiang, Xulong Wang, et al. 2017. The age of human remains and associated fauna from Zhiren cave in Guangxi, Southern China. Quaternary International 434 (A): 84–91.
4. Chai, Sunglin. 1977. Population and population policy in mainland China. Taipei: Asia and the World Forum Monograph Series, No.6.
5. Chan, Kam Wing. 2010. The household registration system and migrant labor in China: Notes on a debate. Population and Development Review 36 (2): 357–364.