Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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