000 00279nam a2200121Ia 4500
001 77962
008 170722s9999 xx 000 0 und d
100 _aWalker, Stephen
245 _aLearning and reinforcement /
260 _bMathuen
_c1975
300 _app 144,18cm
942 _cGEN
999 _c8055
_d8055