TY  - BOOK
AU  - Roruch, Robert F.
TI  - Randomized experiments for planning and evalution: Practical Guide
T2  - Applied social research methods series
SN  - 0803935102
U1  - 300.72 
PY  - 1997///
CY  - ThousaNew Delhi Oaks
PB  - Sage Publications
ER  -