TY  - BOOK
AU  - Posavac, Emil J.
AU  - Carey, Raymond G.
TI  - Program evaluation : methods and case studies
SN  - 0137296657
AV  - H62.5.U5P62 
PB  - Prentice-Hall
KW  - Evaluation research (Social action programs) -- United States
KW  - H
N1  - Bibliography: p. 332-342
ER  -