000 00267nam a2200109Ia 4500
100 _aChild Development; Vol 38
942 _cBK
654 _a
245 _aChild Development; Vol 38
_b1967
260 _aIllinois
_bUniversity of Chicago Press
_c1967
082 _a155.405
999 _c414531
_d414531
041 _aeng