4MESSERI, P. SILVERSTEIN, M. & LITWAK,E. Choosing optimal support groups: a review and reformation[J]. Journal of Health and Social Behavior, 1993,34(2 ): 122-137.
5SILVERSTEIN, M., BENGSTON, V. L. & LITWAK, E. Theoretical approaches to problems of families, aging and social support in the context of modernization[M]//SIMON BIGGS,ARIELA LOWENSTEIN & JON HENDRICKS (Eds.). The Need for Theory Critical Approaches to Social Gerontology. New York: Baywood Publishing Company, 2003.
