U.S. Census Bureau. (2005). U.S. Census Bureau, Statistical abstract of the United States: 2004-2005. Social insurance and human services. (Section 11, Table 525, p. 348). Washington, DC: U.S. Census Bureau. Retrieved July 15, 2005, from http://www.census.gov/prod/www/statistical-abstract-2001_2005.html

"This section presents data related to governmental expenditures for social insurance and human services; governmental programs for old-age, survivors, disability, and health insurance (OASDHI); governmental employee retirement; private pension plans; government unemployment and temporary disability insurance; federal supplemental security income payments and aid to the needy; child and other welfare services; and federal food programs." "The principal source for these data is the Social Security Administration's Annual Statistical Supplement to the Social Security Bulletin which presents current data on many of the programs."