Card, D. (1993). Using geographic variation in college proximity to estimate the return to schooling.
Chicago-Zitierstil (17. Ausg.)Card, David. Using Geographic Variation in College Proximity to Estimate the Return to Schooling. Cambridge, Mass, 1993.
MLA-Zitierstil (9. Ausg.)Card, David. Using Geographic Variation in College Proximity to Estimate the Return to Schooling. 1993.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.