000 00281nam a2200121Ia 4500
008 240421s9999 xx 000 0 und d
100 _aSkinner, Charles E.
245 0 _aEducational Psychology
250 _a4th
260 _aNew Delhi
_bPHI
_c1959
300 _a755p.
942 _cBK
999 _c11149
_d11149