TY  - BOOK
AU  - Johnson David W.
AU  -  Johnson Roger T.
TI  - Learning together and alone : Cooperative, competitive, and individualistic learning
SN  - 0-205-28771-9
PY  - 1999///
CY  - Boston, USA
PB  - Allyn and Bacon
KW  - Group work in education; Lesson planning; Learning
ER  -