5BarbaraA;Butrica;Howard M;Iams E. Smith., The Changing Impact of Social S on Retirement Income in the United States. Security Bulletin, Vol. 65 No. 3, 2003/2004. ;Karen ecurity Social.
6OECD, Pensions at a Glance, 2011.
7Robert J. Palacios. Averting the Old-Age Crisis; policies to protect the old and promote growth. World Bank Policy Report,1994.
8World Bank, Averting the Old Age Crisis: a World Bank Policy Research Report, Oxford University Press. 1994.