000 00270nam a2200121Ia 4500
100 _aSkinner, B.F
942 _cBK
654 _a
245 _aBeyond freedom and dignity
260 _aNew York
_bAlfred A. Knopf
_c1971
082 _a041
300 _bHb
_c22cm
_a(10),226,4
999 _c407488
_d407488
041 _aeng