000 00297nam a2200121Ia 4500
008 220901s9999 xx 000 0 eng d
082 _a371.33 UPA
100 _aUpadhyay, Sanjay Kr.
245 0 _aEducational Technology
260 _bRakhi Prakashan
_aAgra
_c2014
300 _a152
942 _2ddc
_cBK
999 _c3098
_d3098