TY  - BOOK
AU  - Mangal,S.K.
AU  - Mangal,Uma
TI  - Essentials of educational technology
SN  - 9788120337237
U1  - 371.335 
PY  - 2009///
CY  - Delhi
PB  - PHI learning, 
KW  - India
KW  - Educational technology
N1  - Includes index
ER  -