000 00270nam a2200109Ia 4500
008 240421s9999 xx 000 0 und d
100 _aGupta, Naresh Kumar
245 0 _aResearch In Teaching Of Science
260 _aNew Delhi
_bAPH
_c2012
300 _a210p.
942 _cBK
999 _c15694
_d15694