1. Bryman, A. and Bell, E. (2011). Business Research Methods. 3rd edition. Oxford: Oxford University Press.
2. Chawla, L. (ed.). (2002). Growing Up in an Urbanising World. London: Earthscan.
3. Dawson, C.K. (2013). The heartbreak of child abduction. [online]. New York, China Daily USA. Available from: http://usa.chinadaily.com.cn/epaper/2013-08/23/content_16916550.htm [Accessed 10th September 2015].
4. Ding, Y. (2007). The research and planning consideration on urban children's playing space- Taking the City of Wuhan as an Example. Harmonious society planning- The Paper Collection of 2007 China City planning. (1), pp. 1256-1263.
5. Ding, Y. (2006). The Study of Children's Outdoor Play Space in the Contemporary City. M. Sc. Urban Planning, Huazhong University of Science & Technology.