TY  - BOOK
AU  - Walberg,Herbert J.
TI  - Educational environments and effects: evaluation, policy and productivity 
T2  - The National Society for the Study of Education
SN  - 0821122592
U1  - 370.973 
PY  - 1979///
CY  - Berkeley, CA.
PB  - McCutchan
KW  - Ambiente educativo
ER  -