TY  - BOOK
AU  - Rossi, Peter H.
AU  - Freeman, Howard E.
AU  - Lipsey, Mark W.
TI  - Evaluation: a systematic approach
SN  - 0761908935
U1  - 361.61072 
PY  - 1999///
CY  - Thousand Oaks
PB  - Sage publications
ER  -