1. The Index of ADL: A standardized measure of biological and psychosocial function;Katz;JAMA,1963
2. Administration on Aging. Characteristics of the Title III nutrition program participants, Chapter II, Part A: Characteristics of participants Serving the elders at risk: The Older Americans Act nutrition programs national evaluation of the Elderly Nutrition Programs 1993-1995 http:www.aoa.dhhs.govgovnutrevalfulltextvlch2al.html