000 00267nam a2200121 4500
082 _a610.7
100 _aKumar , N .
245 _aEducational Technology
250 _aFirst Ed
_b20221
260 _aN.Delhi
_bAITBS Pub
_c2021
300 _a446 Pages
942 _2ddc
_cBK
999 _c2968
_d2968