TY  - BOOK
AU  - Langbein,Laura Irwin
TI  - Discovering whether programs work: a guide to statistical methods for program evaluation 
SN  - 0673162605
U1  - 361.6/1/0724 19
PY  - 1980///
CY  - Glenview, Il.
PB  - Scott, Foresman
KW  - Social sciences
KW  - Statistical methods
KW  - Evaluation research (Social action programs)
N1  - Originally published: Santa Monica, Calif. : Goodyear Pub. Co., c1980; Includes bibliographies and index
ER  -