共 39 条
[31]
SHORTELL SM, 1984, INTRO HLTH SERVICES
[34]
TINSLEY BJ, 1989, J DEV BEHAV PEDIATR, V10, P236
[35]
US Census Bureau, 1994, STAT ABSTR US
[36]
*US DEP ED, 1994, 16 ANN REP C IMPL IN
[39]
WOOD DL, 1990, PEDIATRICS, V86, P666