000 00274nam a2200109Ia 4500
008 240421s9999 xx 000 0 und d
100 _aSingh, Y.K.
245 0 _aEducational Technology Teaching Learning
260 _aNew Delhi
_bA.P.H.
_c2009
300 _a332p.
942 _cBK
999 _c13539
_d13539