APA (7e ed.) Bronvermelding

Friedberg, L. (1998). The effect of old age assistance on retirement. National Bureau of Economic Research.

Chicago (17e ed.) Bronvermelding

Friedberg, Leora. The Effect of Old Age Assistance on Retirement. Cambridge: National Bureau of Economic Research, 1998.

MLA (9e ed.) Bronvermelding

Friedberg, Leora. The Effect of Old Age Assistance on Retirement. National Bureau of Economic Research, 1998.