1. American Association of Retired Persons. 2011. Aging in Place: A State Survey of Livability Policies and Practices. (December 2011). http://www.aarp.org/home-garden/livable-communities/info-11-2011/Aging-In-Place.html
2. O. Amir, B. J. Grosz, E. Law, and R. Stern. 2014. Collaborative Health Care Plan Support. In Proceedings of International Conference on Autonomous Agents and Multiagent Systems. AAMAS, 793--796.
3. J. Beard, S. Biggs, D. Bloom, L. Fried, P. Hogan, A. Kalache, and S. Olshansky. 2012. Global Population Ageing: Peril or Promise? Technical Report. Geneva: World Economic Forum.
4. Blackbox Research Pte Ltd. 2012. Smartphones in Singapore: A Whitepaper Release. (May 2012). http://www.blackbox.com.sg/yka-smartphones-in-singapore/
5. Centers for Disease Control and Prevention. [n. d.]. Healthy Places Terminology. ([n. d.]). http://www.cdc.gov/healthyplaces/terminology.htm