000 00304nam a2200121Ia 4500
001 84811
008 170722s9999 xx 000 0 und d
100 _aBany, Mary A.
245 _aClassroom group behaviour
_bGroup dynamics in education /
260 _c1964.
700 _aJohnson, Lois V.
942 _cGEN
999 _c63824
_d63824