TY  - BOOK
AU  - Guba,, Egon G.
TI  - Effective Evaluation
SN  - 0875894933
AV  - AZ 191  .G8 1981
PY  - 1981///
CY  - London
PB  - Josse.Bass
N1  - Includes index and bibliographic refrences
ER  -