000 00275nam a2200121Ia 4500
100 _aRuhela, Satya Pal
942 _cBK
245 _aEducational Technology
260 _aAmbala
_bAssociated Publication
_c1991
082 _a371.394
_bRuh
300 _a348
546 _aEnglish
999 _c337204
_d337204
041 _aeng