TY  - BOOK
AU  - Mangal, S.K
AU  - Mangal, Uma
TI  - Essentials of educational technology
SN  - 9788120337237
AV  - LB1028.3.M36 2011 
PY  - 2011///
CY  - New Delhi
PB  - PHI
KW  - Educational technology
N1  - Includes index
ER  -