000 00284nam a2200121Ia 4500
100 _aKhan, Mohd Sharif
020 _a81-7024-373-4
942 _cBK
245 _aEducational research
260 _aAshish publishing house, New Delhi
_c1990
082 _a370.78 Kha
300 _aviii,164
999 _c35190
_d35190