APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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