TY  - BOOK
AU  - Kline, Patrick
AU  - Walters, Christopher
ED  - National Bureau of Economic Research
TI  - Evaluating public programs with close substitute : : The Case of head start 
T2  - NBER Working Paper
PY  - 2015///
CY  - Cambridge
PB  - NBER
KW  - NBERWP 21658
KW  - E15831.pdf
UR  - http://elibrary.igidr.ac.in/e-library/working papers/NBER/2015/E15831.pdf
ER  -