000 00297nam a2200109Ia 4500
008 240531s9999 xx 000 0 und d
082 _a370 78DAL
100 _aDalen ,D,B
245 0 _aUnderstanding educational research. an introduction.
260 _aNew York
_b McGraw-Hill
_c1985
942 _cANF
999 _c331633
_d331633