Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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