Costa, D. L. (1998). Understanding the twentieth century decline in chronic conditions among older men. National Bureau of Economic Research.
Chicago-Zitierstil (17. Ausg.)Costa, Dora L. Understanding the Twentieth Century Decline in Chronic Conditions Among Older Men. Cambridge, Mass: National Bureau of Economic Research, 1998.
MLA-Zitierstil (9. Ausg.)Costa, Dora L. Understanding the Twentieth Century Decline in Chronic Conditions Among Older Men. National Bureau of Economic Research, 1998.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.