000 00257nam a2200109Ia 4500
008 240421s9999 xx 000 0 und d
100 _aPandey, V.C.
245 0 _aEdcuational Technology
260 _aDelhi
_bIsha Books
_c2007
300 _a312p.
942 _cBK
999 _c12076
_d12076