Sources:  
California Department of Health Services, Office of Vital Records.  Number and Percent of Live Births with Late or No Prenatal Care, California Counties, 1990-2001.  [Updated 24 September 2002; Cited 25 July 2003].  Available at http://www.dhs.ca.gov/hisp/chs/ohir/vssdata/2001data/2001ncountyex.htm.

Healthy People 2010 Information Access Project.  Maternal, Infant and Child Health. 

Centers for Disease Control and Prevention, Morbidity and Mortality Weekly Report.  Adequacy of Prenatal-Care Utilization.  [Updated 2 May 2001; Cited 25 July 2003].  Available at http://www.cdc.gov/mmwr/preview/mmwrhtml/00043211.htm.