TY  - BOOK
AU  - Langbein,Laura Irwin
TI  - Discovering whether programs work : a guide to statistical methods for program evaluation
SN  - 0830222146
U1  - 361.6072 L271D 1980 
PY  - 1980///
CY  - California
PB  - Goodyear Publishing Company
KW  - Social sciences
KW  - Statistical methods
KW  - Evaluation research (Social action programs)
N1  - Include index
ER  -