5Ahn,S.N,Phillips,K.L,Smith,M.L,Ory,M. Correlates of volunteering among aging Texans:The roles of health indicators,spirituality,and social engagement[J].Maturitas,2011.257-262.
6Bowling,A,Stafford,M. How do objective and subjective assessments of neighbourhood influence social and physical functioning in older age? Findings from a British survey of ageing[J].Social Science & Medicine,2007.2533-2549.
7Belvis,A.G,Avolio,M,Sicuro,L,Rosano,A Latini,E Damiani,G.& Ricciardi,W. Social relationship and HRQL:A cross-sectional survey among older Italian adults[J].BMC Public Health,2008.348-357.
8Beswick,A.D,Rees,K,Dieppe,P,Ayis,S Gooberman-Hill,R Horwood,J & Ebrahim,S. Complex interventions to improve physical function and maintain independent living in elderly people:A systematic review and meta-analysis[J].The Lancet,2008.725-735.
9Bravell,M.E,Berg,S,Malmberg,B. Health,functional capacity,formal care,and survival in the oldest old:A longitudinal study[J].Archives of Gerontology and Geriatrics,2008.1-14.
10Bures,R.M,Koropeckyj-Cox,T,Loree,M. Childlessness,parenthood,and depressive symptoms among middle-aged and older adults[J].Journal of Family Issue,2009.670-688.
