000 00220 a2200097 4500
001 19302
100 _aDalen, D B V
245 _aUnderstanding educational research
260 _a
_bMC Graw Hill
_c
090 _c14177
_d14177
942 _aNUST-CAE
_cM
_c4644
999 _c254375
_d254375