00384nam a2200109Ia 4500008004100000100002000041245007300061260000900134300001700143999001700160952009700177210811s9999    xx            000 0 und d  aPetterson, C.H. 0aFoundations for A Theory of Instruction and Educational Psychology    c1977  axiii,346p.    c12579d12579  00134070aNSKTUELbNSKTUELd2021-08-12oT:8(5)p24368r2021-08-12 00:00:00w2021-08-12yBK