Willen, P., Hendel, I., & Shapiro, J. A. (2004). Educational opportunity and income inequality. National Bureau of Economic Research.
Chicago-Zitierstil (17. Ausg.)Willen, Paul, Igal Hendel, und Joel Andrew Shapiro. Educational Opportunity and Income Inequality. Cambridge, Mass: National Bureau of Economic Research, 2004.
MLA-Zitierstil (9. Ausg.)Willen, Paul, et al. Educational Opportunity and Income Inequality. National Bureau of Economic Research, 2004.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.