1. AARP Public Policy Institute 2008 Valuing the Invaluable: The Economic Value of Family Caregiving, 2008 update http://www.aarp.org/relationships/caregiving/info-11-2008/i13_caregiving.html
2. Informal Care for Disabled Elderly: A Critique of Recent Literature;Abel;Research on Aging,1990
3. The Significance of the Self-Perceived Start of Caregiving;Albert;Journal of Clinical Geropsychology,1996