1. China National Committee on Ageing. (2007). Country Statement China: The Ageing of Population and Its Implications in China. Seminar on the Social, Health and Economic Consequences of Population Ageing in the Context of Changing Families, July 25-27, 2007, Bangkok. Retrieved December 14, 2009, from http://www.unescap.org/esid/psis/meetings/ageing_change_family/china.pdf
2. Statistisches Bundesamt Deutschland. (2009). Vorausberechnung Bevölkerung [Population projection]. Retrieved December 14, 2009, from http://www.destatis.de/jetspeed/portal/cms/Sites/destatis/Internet/EN/Content/Publikationen/SpecializedPublications/Population/GermanyPopulation2050,property=file.pdf