Ashenfelter, O. C. (1992). Estimates of the economic return to schooling from a new sample of twins.
Chicago-Zitierstil (17. Ausg.)Ashenfelter, Orley C. Estimates of the Economic Return to Schooling from a New Sample of Twins. Cambridge, Mass, 1992.
MLA-Zitierstil (9. Ausg.)Ashenfelter, Orley C. Estimates of the Economic Return to Schooling from a New Sample of Twins. 1992.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.