1. The Demographic Transition: Three Centuries of Fundamental Change;RD Lee;J Econ Perspect,2003
2. Central Intelligence Agency. The World Factbook: Country Comparison: GDP—Per capita (PPP) [Internet]. 2013 [cited 5 October 2014]. Available: https://www.cia.gov/library/publications/the-world-factbook/rankorder/2004rank.html.
3. Central Intelligence Agency. The World Factbook: Country Comparison: Total Fertility Rate. (2014) [Internet]. 2013 [cited 5 October 2014]. Available: https://www.cia.gov/library/publications/the-world-factbook/rankorder/2127rank.html.
4. Ultra-low fertility in Pacific Asia;G Jones,2009
5. Is Low Fertility a Twenty-First-Century Demographic Crisis?;SP Morgan;Demography,2003