4Social Security Administration, International Social Security Association. Social security programs throughout the world: Europe, 2008 [ M ]. Washington : Government Printing Office, 2008.
5Social Security Administration, International Social Security Association. Social security programs throughout the world: Asia and the Pacific, 2008 [ M]. Washington: Government Printing Office, 2008.
6Social Security Administration, International Social Security Association. Social security programs throughout the world: Africa, 2009 [ M ]. Washington: Government Printing Office, 2009.
7Social Security Administration, International Social Security Association. Social security programs throughout the world: The Americas, 2007 [ M ]. Washington : Government Printing Office, 2007.
