1. World Health Organization.
http://www.who.int/ageing/en/
2. US Labor Employment Projections.
http://www.bls.gov/news.release/pdf/ecopro.pdf
3. Program of All-inclusive Care for the Elderly.
http://www.medicare.gov/your-medicare-costs/help-paying-costs/pace/pace.html
4. World Health Organization. The uses of epidemiology in the study of the elderly: report of a WHO Scientific Group on the Epidemiology of Aging [meeting held in Geneva from 11 to 17 January 1983] (1984)
5. Lee, M.L.: Task-based embedded assessment of functional abilities for aging in place. Diss, Georgia Institute of Technology (2012)