Citazione Stile APA (7a Edizione)

Mulligan, C. B., & Sala-i-Martin, X. (1999). Gerontocracy, retirement, and social security. National Bureau of Economic Research.

Citazione stile Chigago Style (17a edizione)

Mulligan, Casey B., e Xavier Sala-i-Martin. Gerontocracy, Retirement, and Social Security. Cambridge: National Bureau of Economic Research, 1999.

Citatione MLA (9a ed.)

Mulligan, Casey B., e Xavier Sala-i-Martin. Gerontocracy, Retirement, and Social Security. National Bureau of Economic Research, 1999.