APA (7th ed.) Zitazioa
SpringerLink (Online service). BMC Pregnancy and Childbirth. BioMed Central : Imprint: BioMed Central.
Chicago Style (17th ed.) Zitazioa
SpringerLink (Online service). BMC Pregnancy and Childbirth. London: BioMed Central : Imprint: BioMed Central.
MLA (9th ed.) Zitazioa
SpringerLink (Online service). BMC Pregnancy and Childbirth. BioMed Central : Imprint: BioMed Central.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.