APA
Clotfelter C. T., National Bureau of Economic Research, Ladd H. F. & Vigdor J. L. (2015). Public universities, equal opportunity and the legacy of Jim Crow. Cambridge: NBER.
Chicago
Clotfelter Charles T, National Bureau of Economic Research, Ladd Helen F and Vigdor Jacob L. 2015. Public universities, equal opportunity and the legacy of Jim Crow. Cambridge: NBER.
Harvard
Clotfelter C. T., National Bureau of Economic Research, Ladd H. F. and Vigdor J. L. (2015). Public universities, equal opportunity and the legacy of Jim Crow. Cambridge: NBER.
MLA
Clotfelter Charles T, National Bureau of Economic Research, Ladd Helen F and Vigdor Jacob L. Public universities, equal opportunity and the legacy of Jim Crow. Cambridge: NBER. 2015.