TY  - BOOK
AU  - Ekstrom R B
ED  - Educational Testing Service. New Jersey
TI  - Experimental studies of homogeneous grouping: a review of the literature
U1  - 371.26 
PY  - 1959///
CY  - New Jersey
PB  - ETS
KW  - Educational tests and measurements
KW  - Homogeneous grouping
ER  -