000 00267nam a2200109Ia 4500
100 _aChild Development; Vol 45
942 _cBK
654 _a
245 _aChild Development; Vol 45
_b1974
260 _aIllinois
_bUniversity of Chicago Press
_c1974
082 _a155.405
999 _c422491
_d422491
041 _aeng