000 00314nam a2200121Ia 4500
008 200906s9999 xx 000 0 und d
082 _a370.78 V224
100 _aVAN DALEN.D.B
245 0 _aUNDERSTANDING EDUCATIONAL RESEARCH- AN INTRODUCTION
260 _bMCGRAW, NEW YORK
_c1962
300 _a24X15
942 _cBK
999 _c62475
_d62475