TY  - BOOK
AU  - Rossi, Peter H. and Howard E. Freeman
TI  - Evaluation: A systematic approach
SN  - 0-8039-1784-8
AV  - H 62  .R67 1982 
PY  - 1982///
CY  - London
PB  - Sage publications
KW  - Evaluation research
ER  -