1. Estimating the effect of training programs on earnings;Ashenfelter;The Review of Economics and Statistics,1978
2. Do curriculum-based external exit exam systems enhance student achievement?;Bishop,1998
3. No child left behind: Chicago style;Bryk,2003
4. Center For Education Reform, 2002. National Charter School Directory. Washington, DC.
5. Recognizing and rewarding success in public schools;Clotfelter,1996