000 00257nam a2200109Ia 4500
008 240421s9999 xx 000 0 und d
100 _aTaj, Haseen
245 0 _aEducational Technology
260 _aAgra
_bH.P.Bhargava
_c2006
300 _a308p.
942 _cBK
999 _c11747
_d11747