000 00291nam a2200121Ia 4500
008 160601s9999 xx 000 0 und d
100 _aMcasban, Hilbreth Hoke
_910874
245 _aElements of educational researach
260 _aNew York
260 _bM-Hill
260 _c1963
300 _a208
999 _c3511
_d3511