National Center for Health Statistics (U.S.). Vital and health statistics: Vital health stat. Ser. 21, Data natal. marriage divorce (Online). Hyattsville, Md.: U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control, National Center for Health Statistics.
Citación estilo ChicagoNational Center for Health Statistics (U.S.). Vital and Health Statistics: Vital Health Stat. Ser. 21, Data Natal. Marriage Divorce (Online). Hyattsville, Md.: U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control, National Center for Health Statistics.
Cita MLANational Center for Health Statistics (U.S.). Vital and Health Statistics: Vital Health Stat. Ser. 21, Data Natal. Marriage Divorce (Online). Hyattsville, Md.: U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control, National Center for Health Statistics.