000 00266nam a2200121Ia 4500
100 _aSkinner, C.E.
942 _cBK
245 _aEducational Psychology
260 _aLondon
_bStaples press
_c1956
082 _a370.15
_bSki
300 _aviii,631
546 _aEnglish
999 _c340127
_d340127
041 _aeng