000 00261nam a2200121Ia 4500
100 _aRyburn, W,M.
942 _cBK
654 _a
245 _aEducational psychology
260 _aCambridge
_bOxford University Press
_c1949
082 _a370.15
300 _a308
999 _c415489
_d415489
041 _aeng