1. Administration on Aging. (1997). Compassion in action: A look at caregiving in America: 1997 (on-line). Available at http://www.aoa.gov/may97compassion.html.
2. Administration on Aging. (2002). A profile of older Americans: 2002 (on-line). Available at http://www.aoa.gov/aoa/stats/profile/default.html.
3. Measuring mature markets;Allan;American Demographics,1981
4. The economic value of informal caregiving;Arno;Health Affairs,1999
5. Senior traveler study;Bandenelli;Hotel and Motel Management,1991