Mulligan, C. B., & Sala i Martín, X. (1999). Gerontocracy, retirement, and social security. National Bureau of Economic Research.
Cita Chicago Style (17a ed.)Mulligan, Casey B., y Xavier Sala i Martín. Gerontocracy, Retirement, and Social Security. Cambridge, MA: National Bureau of Economic Research, 1999.
Cita MLA (9a ed.)Mulligan, Casey B., y Xavier Sala i Martín. Gerontocracy, Retirement, and Social Security. National Bureau of Economic Research, 1999.
Precaución: Estas citas no son 100% exactas.