TY  - BOOK
AU  - Mangal, S.K.
AU  - Uma Mangal
TI  - Essentials of educational technology
SN  - 9.78812E+12
U1  - 371.33 
PY  - 2013///
CY  - PHI LEARNING
PB  - Delhi
KW  - Education
N1  - Including Index
ER  -