TY  - GEN
AU  - YELON, Stephen L
TI  - Powerful principles of instruction
SN  - 0-8013-1643-X
AV  - LB1025.3.Y45 
PY  - 1996///
CY  - London
PB  - Longman Publishers
KW  - Teaching
KW  - Learning
KW  - Teachers
ER  -