1. Into a new world,1998
2. Kids having kids,1996
3. Ventura SJ, Martin JA, Curtin SC, Mathews TJ. Births: final data for 1997. DHHS Pub. No. PHS 99–1120; National Vital Statistics Reports, Vol. 47, No. 18. Hyattsville, MD: National Center for Health Statistics, 1999 .
4. MacDorman MF, Atkinson JO. Infant mortality statistics from the 1997 period linked birth/infant death data set. DHHS Pub. No. PHS 99–1120; National Vital Statistics Reports, Vol. 47, No. 23. Hyattsville, MD: National Center for Health Statistics, 1999.
5. National Center for Health Statistics. Vital statistics of the United States, 1993, Vol. I, natality. DHHS Pub. No. PHS 99–1100. Hyattsville, MD: National Center for Health Statistics, 1999.