5Levi L and Andersson.L:Popuiation.Enviroment and Quality of lifelRoyal for foreign Atfair 1987
6Kat S and Akpon A.A of primarg socr albiological fanctions Int.J Health serr 1976:493
7John e.Keu P C Gazes predictors of physical dis akility in elceerly blacks and whites of the tharleston heart study.Jclin Epide 1989:42(6):521
8Bradburn NMet al.The structure of psycholo gical well-being chicago Alcline,1969
9Woocl V.wyline ML.Sheafor B.An anaiysls of a short selfreport Messuvement of life satist aclion:corr lation nith ratev Juclernent J Eerontol 1969:24:465 ~ 469