1. Advance report of final natality statistics, 1991;Monthly Vital Statist Rep,1993
2. National Center for Health Statistics. Report of final natality statistics, 1995. Monthly Vital Statist Rep 1997;45:6–8.
3. Los Angeles County, Department of Health Services. Vital statistics of Los Angeles County. Los Angeles Department of Health, 1989.
4. Pregnancy outcomes among Spanish-surname women in California;Williams;Am J Public Health,1986
5. National Center for Health Statistics, 1985. Plan and operation of the Hispanic health and nutrition examination survey, 1982–1984 (Pub. No. PHS 81-1317). Washington, DC: Government Printing Office.