APA (7th ed.) Citation

Costa, D. L. (1998). Understanding the twentieth century decline in chronic conditions among older men. National Bureau of Economic Research.

Chicago Style (17th ed.) Citation

Costa, Dora L. Understanding the Twentieth Century Decline in Chronic Conditions Among Older Men. Cambridge, Mass: National Bureau of Economic Research, 1998.

MLA (9th ed.) Citation

Costa, Dora L. Understanding the Twentieth Century Decline in Chronic Conditions Among Older Men. National Bureau of Economic Research, 1998.