Cita APA (7a ed.)

Gruber, J., & Wise, D. A. (1997). Social security programs and retirement around the world. National Bureau of Economic Research.

Cita Chicago Style (17a ed.)

Gruber, Jonathan, y David A. Wise. Social Security Programs and Retirement Around the World. Cambridge, MA: National Bureau of Economic Research, 1997.

Cita MLA (9a ed.)

Gruber, Jonathan, y David A. Wise. Social Security Programs and Retirement Around the World. National Bureau of Economic Research, 1997.