APA
Costa D. L., National Bureau Of Economic Research, . (1993). Health, Income, And Retirement: Evidence From Nineteenth Century America. Cambridge, MA: NBER.
Chicago
Costa D L, National Bureau Of Economic Research, . 1993. Health, Income, And Retirement: Evidence From Nineteenth Century America. Cambridge, MA: NBER.
Harvard
Costa D. L., National Bureau Of Economic Research, . (1993). Health, Income, And Retirement: Evidence From Nineteenth Century America. Cambridge, MA: NBER.
MLA
Costa D L, National Bureau Of Economic Research, . Health, Income, And Retirement: Evidence From Nineteenth Century America. Cambridge, MA: NBER. 1993.