00327nam a2200121Ia 4500008004100000082001500041100002000056245004800076260004600124300001100170942000700181999001700188190709s9999    xx            000 0 und d  a370.15 Ei5  aEllis, Robert S 0aEducational psychology : a problem approach  aNew JerseyybD Van Nostrand Companyc1965  axi,546  cBK  c35893d35893