TY  - BOOK
AU  - Shadish,William R
AU  - Cook,Thomas D.
AU  - Leviton,Laura C.
TI  - Foundations of program evaluation: theories of practice 
SN  - 0080393551
U1  - 361.60684 20
PY  - 1991///
CY  - Newbury Park, Calif.
PB  - Sage Publications
KW  - Evaluation research (Social action programs)
N1  - Includes bibliographical references (p. 486-511) and indexes
ER  -