共 75 条
[1]
AHN N, 1999, ANN M POP ASS AM MAR
[5]
[Anonymous], 2004, DEMOGRAPHIC RES
[6]
[Anonymous], 1988, First births in America: Changes in the tempo of parenthood
[7]
ASPLANVIAK, 2005, ANAL DAY CARE NU SEP
[8]
Becker G.S., 1960, Demographic and Economic Change in Developed Countries