APA

E.U.A. Social Security Administration, . (2010). Social Security Programs Throughout the World: The Americas, 2009. U.S.A: Social Security Administration (SSA).

Chicago

E.U.A. Social Security Administration, . 2010. Social Security Programs Throughout the World: The Americas, 2009. U.S.A: Social Security Administration (SSA).

Harvard

E.U.A. Social Security Administration, . (2010). Social Security Programs Throughout the World: The Americas, 2009. U.S.A: Social Security Administration (SSA).

MLA

E.U.A. Social Security Administration, . Social Security Programs Throughout the World: The Americas, 2009. U.S.A: Social Security Administration (SSA). 2010.