Cita APA (7a ed.)

Friedberg, L. (1999). The labor supply effects of the social security earnings test. National Bureau of Economic Research.

Cita Chicago Style (17a ed.)

Friedberg, Leora. The Labor Supply Effects of the Social Security Earnings Test. Cambridge, MA: National Bureau of Economic Research, 1999.

Cita MLA (9a ed.)

Friedberg, Leora. The Labor Supply Effects of the Social Security Earnings Test. National Bureau of Economic Research, 1999.