TY  - BOOK
AU  - Rossi,Peter Henry
AU  - Freeman,Howard E.
AU  - Rosembaum,Sonia
TI  - Evaluation: a systematic approach 
SN  - 0803917848
AV  - H62 R68.4 1982
PY  - 1982///
CY  - Beverly Hills, EUA
PB  - Sage Publications
KW  - INVESTIGACION EVALUATIVA
ER  -