TY  - BOOK
AU  - Posavac Emil J
AU  -  Carey Raymond G
TI  - Program evaluation:  Methods and case studies   
SN  - 013729665
U1  - Sigma b4.73.N7, M0 
PY  - 1980///
CY  - New Jersey 
PB  - Prentice-Hall         
KW  - Social Science
ER  -