共 33 条
- [31] 1ST INTERCOURSE AMONG YOUNG AMERICANS [J]. FAMILY PLANNING PERSPECTIVES, 1983, 15 (02): : 64 - 70
- [32] SEXUAL-ACTIVITY, CONTRACEPTIVE USE AND PREGNANCY AMONG METROPOLITAN-AREA TEENAGERS - 1971-1979 [J]. FAMILY PLANNING PERSPECTIVES, 1980, 12 (05): : 230 - &
- [33] Zelnik M., 1981, SEX PREGNANCY ADOLES