000 00267nam a2200109Ia 4500
100 _aChild Development; Vol 39
942 _cBK
654 _a
245 _aChild Development; Vol 39
_b1968
260 _aIllinois
_bUniversity of Chicago Press
_c1968
082 _a155.405
999 _c397882
_d397882
041 _aeng