000 00273nam a2200121Ia 4500
008 180721s9999 xx 000 0 und d
100 _aMANGAL S.K
245 0 _aEssentials of educational technology
260 _bPHI
260 _c2013
365 _b316.00
942 _cBK
999 _c158618
_d158618