000 00271nam a2200109Ia 4500
008 190719s9999 xx 000 0 und d
100 _aJohn W. Best & James V.Khan
245 0 _aResearch in Education
250 _a9th
260 _aN.D
_bPractice Hall
_c2005
942 _cBK
999 _c13878
_d13878