Costa, D. L. (1997). Unequal at birth: A long-term comparison of income and birth weight. National Bureau of Economic Research.
Chicago-referens (17:e uppl.)Costa, Dora L. Unequal at Birth: A Long-term Comparison of Income and Birth Weight. Cambridge: National Bureau of Economic Research, 1997.
MLA-referens (9:e uppl.)Costa, Dora L. Unequal at Birth: A Long-term Comparison of Income and Birth Weight. National Bureau of Economic Research, 1997.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.