Regímenes de seguridad social en las Américas, 1993.

Washington, D.C. : U.S. Dept. of Health and Human Services, Social Security Administration, Office of Policy, Office of Research, Statistics and International Policy, 1994

Regímenes de seguridad social en las Américas, 1989.

Washington, D.C. : U.S. Dept. of Health and Human Services, Social Security Administration, Office of Policy, Office of Research, Statistics and International Policy, 1990

Regímenes de seguridad social en las Américas, 1983.

by Campbell, G. Ricardo (Gary Ricardo)
Washington, D.C. : U.S. Dept. of Health and Human Services, Social Security Administration, Office of Policy, Office of Research, Statistics and International Policy, 1985