Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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