Cita APA (7th ed.)

Engelhardt, G. V., Gruber, J., & Perry, C. D. (2002). Social security and elderly living arrangements. National Bureau of Economic Research.

Cita Chicago (17th ed.)

Engelhardt, Gary V., Jonathan Gruber, i Cynthia D. Perry. Social Security and Elderly Living Arrangements. Cambridge: National Bureau of Economic Research, 2002.

Cita MLA (9th ed.)

Engelhardt, Gary V., et al. Social Security and Elderly Living Arrangements. National Bureau of Economic Research, 2002.