000 00267nam a2200109Ia 4500
100 _aChild Development; Vol 43
942 _cBK
654 _a
245 _aChild Development; Vol 43
_b1972
260 _aIllinois
_bUniversity of Chicago Press
_c1972
082 _a155.405
999 _c419822
_d419822
041 _aeng