TY  - BOOK
AU  - Richard A. Berk
AU  -  Peter H. Rossi, 
TI  - Thinking about program evaluation
SN  - 0-8039-3704-0
U1  - 658.404 
PY  - 1990///
CY  - New Delhi
PB  - Sage Publications
N1  - Richard A. Berk & Peter H. Rossi: Thinking about program evaluation.  New Delhi.  Sage Publications, 1990. 0-8039-3704-0--(658.404BER)
ER  -