Bound, J., & Solon, G. (1998). Double trouble on the value of twins-based estimation of the return to schooling. National Bureau of Economic Research.
Chicago-referens (17:e uppl.)Bound, John, och Gary Solon. Double Trouble on the Value of Twins-based Estimation of the Return to Schooling. Cambridge: National Bureau of Economic Research, 1998.
MLA-referens (9:e uppl.)Bound, John, och Gary Solon. Double Trouble on the Value of Twins-based Estimation of the Return to Schooling. National Bureau of Economic Research, 1998.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.