1. Department of Economic and Social Affairs, Population Division. World population ageing 1950–2050,2002
2. Statistical report on social service development in 2013 issued by the Ministry of Civil Affairs,2014
3. Notice of the Ministry of Civil Affairs and the National Development and Reform Commission on issuing the 12th five-year civil affair development plan,2011
4. China: Awakening giant developing solutions to population aging;Zhang;Gerontologist,2012
5. Development of Residential Care for Older Persons in China: A Case Study of Tianjin;Liu,2006